When I'm daytrading I also consider EMA crossings, but my point is that doing it systematically (which is the whole point of using a system :)) is much inferior to b&h, and in fact is unprofitable many (if not most of) times. Some of Goombo's posts suggests the opposite, but then he admits he is not following his own system :)
I think this is your course of action: you check the EMAs and use that info to decide whether to trade or not, but you factor other elements (market depth, sentiment, overbought/oversold indicators, money flow, etc. etc. etc.). Plus, you place limit orders (as I do 99% of the times), so you probably miss quite a lot trades because the order is not met after the cross signal was triggered. During a down/up move, a wall as small as 500BTC in the opposite direction of the trend will be probably eaten just a little, if at all. Breaking it in smaller walls spreaded on a bigger price range is also not very effective when the price is going in the opposite direction :). At the end of the day, that's very time consuming and pretty much like gambling, there are a lot of factors to consider, and it is in no way the cold, systematic, robot-like approach Goombo seems to suggest in his thread.
Following my experience, the time consumed in analyzing all the different indicators to daytrade (should I wait for a bid wall to raise so I can sell into it? are we overbought? how close are we from the 50/100/whatever day EMA? etc. etc. etc.) is usually not worth it. This is not Forex, the market is so small that a single whale buy/dump invalidates all the technical analysis you did by taking the price many points up or down, regardless of what technicals were saying. I've personally increased my BTC "trading funds" by aprox. 50% in the last months, but honestly I invested too much time on daytrading, and I was able to have that result just because it was too obvious that the price was going down after a bubble pop. Before the April, 10th crash I just held, and I think it was a good choice. I'm now giving a try to arbitrage (waiting +10 days for a SEPA transfer coming from Gox), but my "daytrading" time is finished for now. I increased my coins during an obvious opportunity (post-bubble crash), now in my opinion is time to hold again (at least for me, taken into consideration my average entry point is in the $10-20 range). I'm not saying price won't go sub $100 again (I think $100 will be tested again sooner or later), just that for me its not time any more to risk coins by daytrading unless some other obvious situation happens.
Obviously b&h worked really well for you, so I want to make it clear that I'm not trying to convince you to use a different method. But there are some points in your argument where you're assuming too much about the alternative methods.
re: "Robot like trading". Goomboo says he does, but I don't do it. In my view, there's a scale, from "pure intuition" to "purely mechanical" trading. Following, roughly, a strategy like the ones in Goomboo's thread simply means to lean strongly towards the mechanical side, but that doesn't mean you never use your intuition.
re: Goomboo's original method. The thread has substantially evolved. Goomboo's original method (1 hour EMA20+10, no threshold) is completely *unprofitable* now. That's why the thread has been about finding and backtesting different parameters, for the past 30 pages or so, and they have been found and posted.
re: Time commitment. Sure, an hourly EMA method takes more time than b&h. But you should keep that argument separate from the profitability question. If you say (near) algorithmic trading is too time consuming, that's a personal choice. If you say it's not profitable, that's something that can be (somewhat) tested.
re: Your own trading method. I remember you sold your trading stash at around 130 in May, correct? (good call, by the way :D). What made you do that -- Intutition? TA? Probably a combination of the two. My point is, not everyone has an equally strong intuition, especially not new investors. There are several parameter combinations of a *daily* EMA crossover that would have given a sell signal in May as well (a bit later than 130 though), and would have resulted in a nice increase of your coin stash when buying back in July. Note that in this case, it wouldn't have been very time consuming (because of *daily* EMA), and not very expensive wrt fees & slippage (because only very few trades).
In the end, everyone uses the method he likes best, too many personal factors play a role here to find an "objectively" optimal method. Many other forum members tend to recommend buy & hold as the "default" strategy, but I wouldn't.
In my opinion, the best new, relatively inexperienced investors can do is to employ a "modified buy & hold" strategy. Which means to, 1) use some TA to decide when to buy in, 2) use some more TA to decide when it is really just better to sell (like in May), and in the meantime, 3) just hold.
Algorithmic strategies *with a comparably low sensitivity* (like daily EMA crossover) can play a crucial role in deciding on 1) and 2) -- unrelated to the questions your raise about how high fees & slippage are, or if you should follow TA indicators mechanically or not.