You can fetch a better rate by lending bitcoins on this forum. People get a rate as high as 3%-7% per week which is better and you can lend people with a good reputation to ensure the borrower is trustworthy.
I also buy/sell altcoins with my btc and earn a good profit. I bought ETH when the price was 0.03 and now the price reached 0.06. It's much better than lending money.
This is a nice diversion instead on going to lend or use your money on poloniex better to go solo when you tend to build lending service and as just said you can possibly earn even more here on this forum but be sure on selecting legit guys over here because there are lots of scammers lurking.Lending business is profitable but the risk is very high but if you can handle it well and manage it with ease then there would be no problem at all.