It would take too much time increasing your 1btc capital in providing loans because you dont get a lot on any amount you give as a loan, but maybe that can be quite profitable because i never tried it or nor heard someone talking about this service if how stable it is.
yeah right, it takes a lot of time. even an advantage in one transaction is not more than 0.01, still better to do a trade if you have a fund of more than 1 BTC.
Investing your 1 bitcoin for loans is going to be hard part for you and for me that is not enough if you are going to start out a loaning business because the return with that amount is going to be long and low if you are going to start loaning business it is better if you are going to add some capital maybe 20-50 bitcoins is sufficient.
1bitcoin wouldnt be enough when you are planning to have a lending business maybe in real cash or fiat its already a big amount here in my country but for lending online it would not be ideal since its very risky and you could gain only small returns. as he said you must have enough or huge bitcoin holding when you are giving a loan to someone.
He still could do it with mini loans only to which the max amount will be $100. I saw it somewhere here too. i just don't know how successful he is by now.
still its risky. scammers would do anything even just to scam $20. i would suggest still to go into ICO and do trading.