I'm going to forcefully refund games that I then will get to keep
Why do you want to refund the games?
I changed my mind after I spent time with it and played it.
You shouldn't be cheating a store with fraudulent returns. The store could lose money over this.
But I'll get the game for free if I try to return it.
Don't you think it pays well to be fair in your purchases? The developers worked very hard on their game, think about how they would feel if someone cheated the vendor out of it and they won't get paid for it. How about just getting free demos first, before trying to buy to prevent this?