You dont do much soccer betting right? 30 bets are available - wow. Goto bet365 and you can find some thousend bets or so. OK bet365 is professional, but this is what Im talking about. FB could be a bit more serious with this betting.
You can certainly find thousands of bets on Bet365 but you should remind that bets at Freebitcoin are not fixed-odds bets but pool/parimutuel ones. So if there were too many bets available you would have a very low liquidity in each pool and you would only be able to win few satoshis at the end. So offering more bets can attract more players, but offering too many of them can repel players if the liquidity fall too much.