I'm not talking about the 5 viewer "streamers", I'm talking about the many, many 200+ viewers streamers that get close to 1000 subs a month. You're making out that there are the 50k sub streamers, then everyone else is making nothing. There are loads of people making a decent living from streaming. They will probably never reach the heights of Drdisrespect etc, but they're making a decent wage.
I don't know the exact % of people making a decent wage and I'm sure your 99% was plucked out of thin air.
I suspect some of it down to this being relatively new... youtube is established but a youtuber can't make too much with that level of subscribers... twitch comes along and boom, otherwise more mediocre content providers can still have some decent income.
Much like game development had been around for quite a while before mobile apps came along but some earlier entrants to mobile gaming did rather well with rather basic content, it was a less competitive market initially and it allowed for some indy developers to make some nice $$$ whereas if they'd stuck to modifying existing games etc.. or trying to launch their own PC games then they'd perhaps be making much less if at all.