you can accumulate more FUN tokens by redeeming your RPs in exchange of free FUN token bonus. take advantage of the opportunity as much as you can. as long as freebitco is here, there's chance for FUN token to increase its value.
Redeeming RP for the FUN token bonus is not profitable, considering that 5 FUN tokens per roll are worth 4.5k RP. It means that even if you're able to claim this bonus 20 times per day, you will get only 100 FUN tokens. As for me, it's better to just accumulate 100k RP and exchange it for 100k sats.