Going from 25 prizes to 7 is a great idea?
Cheapskate idea is what it is.
I guess that comes down to what the prize is? if the 7 top prizes are equivalent to 3 or 4 weekly prizes then it's a better thing to win and rewards more consistent players rather than the randomness of a particular round - but just my opinion (didn't say that everyone should necessarily like it).
I hope they have a monthly ranking so players know where they sit going into the last round of a given month (and if you're in with a shot of a top 3 etc)