If the strategy of having everything in one wall is an optimal one is up to discussion. In the end FRR is the only rate where you can get higher returns after the market for funds goes up. Maybe it'll get less and less attractive over time, now that there are undercutting bots around that try to sneak in more fixed rate loans - if the return from the few spikes where rates go up a lot is worth getting 0 for the money you have wound up in open offers remains to be seen - I personally am relatively sceptic about that, at least the default MarginBot algorithm seems to perform very similar to 30 day autolend FRR while adding more work on your end.
I can pretty much promise MarginBot's returns will be MUCH better then FRR when there are big flash runs. It will catch those runs with significant portions of your money, and lend out at or near the top, while FRR will still be lending at a low average. The problem is we don't have many runs like that, because the market is crap, and there's to much money available for margin. If we're lucky we get one good run every 2 months.
(from my results by the way, I'm also fairly sure MarginBot is currently beating FRR by quite a bit in returns, and it doesn't take any effort to maintain at all. 10 minutes to set up, then it'll run all on its own for years and years. I log into it maybe once a week, just to check my returns charts.)
I have no doubt that MarginBot will beat the pants off of the FRR. It is designed to do that. You yourself have shown that it is EASY to set up, it generates more returns, and requires very little work. IF the users cared enough to research other options, then it seems like a no brainer to switch to using your margin bot. They don't seem to care enough...judging by the funds sitting at the FRR.
As I have said in the past, if everyone were to cease using FRR and switch to your bot, there would be more competition for returns, because that 75% of the available funds being offered would now actually be trying to get filled. That is how MarginBot gets better returns, by trying to keep your funds actually being used. It seems like a LOT of the people using the FRR are not getting any returns right now, because there is quite a bit of supply in front of them.
Long story short, your marginbot is available to anyone who wants to use it, probably offers better returns than FRR, can be "set and forget", and yet FRR remains a large portion of available margin. I think that a cursory search, maybe 15 minutes of research and thought would lead me to switch over to your bot, and it seems like a large portion of people offering swaps haven't put in that 15 minutes...
By the way, I believe that you said the default minimum for your bot is .065%? I couldn't find the post where you mentioned it. What would happen if everyone used your bot and left the default value on? A wall? What would happen next? Would people start placing offers in front of that wall? Would we still arrive at exactly where we are now? I think so...
It is funny, because "efficiency" means lower rates, and people argue that the FRR is not efficient. It is playing dumb with your funds. So, people seem to want someone who will compete harder with them. Someone who is really smart trying to beat them to offering a swap. This is what I don't understand. In no area would I prefer to have tougher competition if my goal is to maximize my success. I might hope for that if I enjoy the competition, but not if my goal is to maximize my success.
(let me quickly point out my reply above was actually to Sukrim's FRR / MarginBot post, not just an attempt to add to the FRR sucks discussion. My opinion is out there, I'm done talking about FRR)
but, to quickly answer your other question, yes the default minimum is currently .065% on MarginBot, though I feel like most people have changed it. Either way, there wouldn't be a wall in quite the same way there is with FRR at that point if everyone used MarginBot, for 2 reasons.
1. Its a settable option. Some (probably large percent) would choose something different (put the option in front of people, and even the laziest will at least think about it, don't give them any options and they'll just say good enough, and I'm happy to point you to detailed research google did to show exactly this point)
2. Spread lending. The way the bot works, it doesn't dump all the money into one bin. It spreads the balance across multiple points and rates. The current implementation of this in MarginBot would probably have to improve some if the FRR suddenly disappeared, but it works well with the realities in place as they are, and would be easy to change should those realities change.
I will also point out MarginBot is not a replacement for the FRR as it stands, it was designed pretty much with one thing in mind, to compete with FRR. If FRR were to go away, MarginBot would likely behave very strangely and unpredictably. But if that were ever to become the new reality, I can easily design the bot to deal with those new realities, as I'm currently doing with an eye towards other markets that don't have an FRR system (or, sadly, any volume to speak of).