I don't get it? Why would you want a bot to automate you losing X% of every bet? It's like, no one would play slot machines if they just got 93c back for every $1 they put in, they need the fun/rush of pulling the handle and watching the cherries. Doesn't this bot just automate losing and therefore remove the fun/gamble part?
In the long run absolutely, in the short term you should make money assuming you do this (also assuming the universe doesn't hate you):
Bet on a 49.5ish% chance to win, bet minimum amount, double bet when loss occurs, reset to minimum bet when win occurs.
I used a java script on coinroll.it employing this system. I deposited 0.14BTC, made approximately 1.95BTC and eventually went down to 0.00BTC.