Cup Prize money depends on opponents quality?

[Xplorer]

Each level of the cup has a set prize money, so when you play higher cup levels you have a chance to win more money

I also thought this way . but what I see is that when I was level 3 ( was placed amongst lvl 4,opponents ) cup prize money was more than it is now , now I am level 4 and most of opponents are lvl 4 too .With your logyc the prize money should have been equal . But now I get less money than when I was level 3.