There are a lot of many Bitcoin sites, which also can sometimes offer good profit. Be smart, when investing in them, even good looking BTC site can be simple scam. From the other hand do not look to every BTC site, as scam 100%. With time you will understand, where you can invest your Bitcoins and make profit. 
i am agree with this, because not all bitcoin sites is scam but we still to careful when we want to make investment on that site and don't invest all of your bitcoin so if something happen like the site going scam, you don't have to feel regret because you still have another bitcoin to start from beginning.