If you don't mind me asking, what kinda percentage are you hitting to stay in the black? How big are your units?
I don't mind talking about the horses since I don't bet them anymore. When I was betting horses I bet 5K to win if it looked really good or 1K to win if I was not sure. I had a very high win percentage (in 2007 it was 70% or so) but most of my bets were favorites so I had to bet big to make any money. There were really only three places I could bet ... Pinnacle, Bookmaker/CRIS and Diamond. Pinnacle pulled out of the US, Bookmaker has cut my limits to $300 maximum in horses. To be honest the horse system was not doing as well this year as it should have been. But I had a big July so they cut my limits. Also I hit them pretty hard last year. I cannot make money at the $300 level. I contacted Diamond and they said no way (sister book to Bookmaker). I was very depressed for a while.
After struggling for a few months and busting my ass researching sports betting methods I have finally found a few things that work. I have a science background and am a decent researcher. December is going to be a very good month and I expect it to continue that way for as long as the books will let me bet. There is really no way the plan can fail.
As far as the specifics about the sports betting I am doing right now I would rather not get into details. All I can say is that I wish I had been doing this years ago. Bookmaker did me a favor.