Yes, thank you, I didn't realize that wagering sum has to be considered along with a bankroll. As for 4,75% in a month - I'll have to think it through. This ,eans that money is likely to be returned in 2 years and then I can get profit (if we neglect the price of btc in usd and count btc only).
First off, you don't have to wait for "money to be returned". You can get your initial back at any point (including profit or minus loss depending on performance), so you might get profit starting from the first day you invest.That being said, with 4.57% we're coming out of a very very good month for investors, you can't and should not expect investments to perform this good on a regular basis.
(we had better months, but we also had a lot months that were slower.)
Yes, maybe this is a good idea, because I also believe in altcoins having potential to rise. But I don't have any alts, so I'll have to make more analysis to choose which to buy, where to keep etc. But thanks anyway.
We're having an integrated exchange solution, you can deposit btc and use it to buy alts right on the side without any further transactions. 
