Having $35 minimum deposit means that you are targeting medium-high rollers only. $35 can be something so small for some groups of people but it can be something big for some other groups. Lowering it to lets say $10 for the minimum deposit would give more benefits for you. It is also part of competition among bookies, there are many other trusted bookies out there with lower min deposit. If you have higher min deposit, you cant attract those players who are used to play in other bookies.