Are you nuts?
I discovered btc back in December and played around trading btc for a couple months before discovering altcoins. There are several coins in the last several months that went 100x their price within a week: Aur, MAZA, XC, BC, and most recently Supercoin. In any given week there is usually at least one coin that goes 40x+ and several that go 10x.
Why on earth would someone waste their time trying to time buys and sells with btc to make 10-20% profit?
Yes, it's risky, but let me tell you something - there are a LOT of stupid traders. Anyone who has spent a lot of time with btc and is up in profits with these lousy returns would have a field day.
I am a terrible trader. I have no experience and am self taught mostly by watching and getting dumped on, but I do find it relatively easy to spot new coins that will blow up. I'm up over 10 btc - and that is after accounting for many, many losses during my learning process. Nearly all those gains were made in the last 30 days. Someone with a clue could EASILY be up over 100 btc with the picks I've made in the last 10 days.
Just a thought.
Every single one of those coins you mention have turned to shit. 99.9% of Alt-coins are either flawed in some way that they end up as pump n dumps or designed with the sole intention of being a pump n dump coin. I can't get no access to proper market data for these sh1t coins, I have no inside information, I don't know how to spot one that might actually be of any worth over the longer term.
If you are able to take such large profits, and people who know what they are doing are able to take huge profits, then that must mean that the vast majority are losing their shirts. Anytime I have dabbled in a sh1tcoin I have regretted it.