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No. 25% is the increase of the interest on the BTC balance. Normally you get a daily interest corresponding to an annual interest rate which is 4.08%. If you keep 500000 FUN after one year the annual interest rate will be 5.10% (because 4.08x1.25=5.10).
This isn't one of the big selling points unless you intend to keep a good amount of BTC for several years on the site. With compounded growth it could grow to be a nice amount if you're willing to wait.
Today, I got my third 5000 sat prize in less than two months from the wheel of fortune. I'm still hesitant about trading my BTC for some lower top 100 altcoin, but if you do the math you are practically guaranteed to earn it all back within a relatively short time period.

Third 5000 prize is really good achievement for you because in recent I never have any big prize from this site mostly going with 50 RP Lottery Tickets and Satoshies but you done good job nearly 5$ prizes not bad at all your luck is high so you can do some more good for you right now.