I now heed to the rul of using 1% of your BR for plays and at very most 2%. It's not a lot and not something most people follow, but especially during baseball season it keeps your variance in check.
By putting 10% of your roll on each play, you are bound to go broke sometime during the season. If I'm not mistake (I read it somewhere) over the course of the year your are going to go 0-10 two times even if your plays hit at a 52.3% rate, which is the breakeven point. Betting dogs in this system, likely yields a 45% win rate, therefore the likelyhood of you losing 10 straight is even greater. heck, if you lost 8 straight games you would have only 20% of your BR left.
It makes me wonder why people bet multiple units on baseball plays, there' just no rhyme or reason. Unless the price is way off and you are really getting the best of it, it makes no sense. Baseball is a grind em out game where the person who gets the best price wins. But people don't want to hear that.
Keep your units plays at 3% max - anything else and I'd be willing to bet you go bust sometime this baseball season.