That is very risky in my opinion, but if it's working for you don't change it of course.
I use a much more conservative approach, maybe it's because I first started with poker, and then did some forex trading, and only after that I went for sports betting, and I also prefer doing sports trading, than just "blank bets". Probably because of my background I'm always "obsessed" in limiting my losses at all cost, so I can stay in the game for a very long time, and keep adding profit.