my experiences
I made just under $5k back in 2002 before getting bored with it. I occasionally do the odd casino still when sports betting is quiet, a site I recommend is
http://www.casinoscalpingclub.com - a bunch of likeminded bonus whores!
My strategy was to start out low and increase stakes if winning but not if losing. Basically modified Kelly. The idea is to use good luck to minmise the time spent hitting the rollover, but at the same time minimise your risk of losing your deposit. Returns were slightly above the theoretical returns, given that the house edge I faced was 1% on average.
The house edge is 1% of bets placed. If you deposit $100 and hit a 10 times rollover by 10 bets of $100, the house edge is 1% * 1,000 = 10.
However, if you hit it by 1,000 bets of $1, the house edge now becomes
1% * 1,000 = 10.
So you can see how easy it is to reduce the house edge from $10 to $10 by using big stakes!!
The true reason for bigger stakes, as per one person in this thread, is to hit the rollover faster and increase your hourly rate. It is not true to say that busting out is good news, in fact its a disaster.
Being close to busting out is akin to being "on the bubble" in a poker tourney - ie. 4 players left chasing 3 prizes. Maximum risk of loss for minimal benefits of taking that risk. "On the bubble" play only premium hands justify risking all your chips. Similarly when your balance is low, minimum stakes bonus whoring is called for until your balance increases again, or you bust out.