borrow bitcoins is never useful the only thing that's useful is to invest them.
There are several things you could do with a bitcoin but just borrow them don't make any good profit. So you could
better invest them.
People here usually asks for 0,01btc to 0,15 btc soo the minimum ammount i believe you cand do several things with that besides gambling ,betting it trying to get profit from the bet and the repayment fee.Ofering bitcoin to others takes always a risk at defaulted people,some people force the acocunt sell doing a request of loan.