Loans are very risky if you are asking me, you really need to trust the person to be sure that you can loan them bitcoins, if you didn't pay it when the days come that you really told that you are going to pay it may destroy your image if that people you barrowed money is impatience he will talk about your back and then will not give you second chance

Do you really think that we users can manipulate the Bitcoin price, for that you will be needing around 10% share of the market, and i dont think except miners and exchanges other are holding this much. So i think manipulation of bitcoin price by users is impossible, even from this forum users also. but start counting in thousand of bitcoins. You better manipulate altcoins price, you'll make more money.

You can make money by opening a small shop and selling something. But this will not make you rich. Because you always have to deal with the shop. The important thing is that you have a working system even if you are not in the shop.