I'm not sure I understood it correctly, but betting odds can change drastically? Can then change after I make a bet, or is my bet locked it at a time I made it?
This system uses parimutuel betting, so odds are not fixed until betting ends.
You can see the current odds when you're placing your bet, but those odds may go up or down a bit, depending on how people after you bet. Everyone gets the same odds once betting ends.
Can't speak for everyone, but thats a big issue in my mind. If I want to bet at for example 1.5 odds, and they later become 1.1, thats not good. I'm essentially making a bet, and hoping the odds would be good as well. Thats like a double bet.