To farm BFG with liquidity, you'd need another token (e.g. BSW) so one way or another, it's either investing some funds or taking the gambling risk.
Recently I purchased extra BFGs but I'd be needing roughly 20 BSW before I get to pair them. So I'm staking the latter until I reach the minimum.
I highly recommend that BFG- BSW has a huge 406.10% I advise you to buy BSW it's still cheap, all the other pair with very high APR are paired with BSW, there are a lot of strategies that you can employ when you have BSW, you can add liquidity or directly stake it, which I am doing right now, which is 609.11% APR one of the highest so play on Betfury to gain more BFG token then buy more BSW and stake to gain more BSW.
Yup, I'll be switching over to that pair once the APR from the BSW staking further reduces. So far with the price appreciation, it netted me over 3 BSW valued at $7. Not too shabby from a mere $10!