I like the idea and get what you are saying and not here to bash or anything, but just odn't think it would ever happen, nor is it good business sense for WGT.
Yes, in the one bracket you play in at that particular time, 20 or 25 credits would seem nominal. However, how many of those free brackets are turning over ever hour? or every day? I have no idea, but I have gone to sign up for some of them and they seem to fill up pretty quick, even the premium ones. What if is is hundred per day?
I know even at 500 a day that would only be like 10000 credits, but over the month that adds up. WGT already gives away free credits in weeklies and monthlies. I just can't see them giving away that kind of loot.
As a suggestion, why not have a point system and top 5 or ten in each tier each week get something. Might push people to play more to accumulate the points to be in the top ten for the points.