In order to convert your RP to satoshi you need to have at least 100k of it as well. I do that time to time but it takes more than 2 months now (used to be quicker but my affiliates haven't been as active as they used to be) but in the end it is much smarter to actually keep some of it as satoshi and not withdraw.
You can literally get interest rate on your bitcoins here, so it is wiser to keep it here if you are not going to cash it out to fiat currency right away. Because in the end, even if you put it on some exchange or to your wallet, you will not get interest there, it would still go up and down there, you could still profit or lose there, but here you do all of those things plus you get interest. So I suggest everyone to keep as maximum amount as they can afford in freebitco.in wallets.
Ouf that's quite a lot of RP!
I suppose it's good in a way to encourage actual gamblers instead of freeloaders, but I just checked my balance and saw I'm not even at 10k after all these years. Doubt I'll ever want to wager to get that 100k min, although if price does dip again, those RP would be worth a bit now hmm? I mean, didn't RP use to be worth 2 satoshis at some point? It's been a year at least since I last checked!
Oh and I'd really recommend not keeping everything in FBC wallets or any online wallets. Love the site, but always put what you can afford to lose here. Be a responsible Bitcoin user, ey?