Well, in my experience the mining is not profitable, but the trade of Hashlet / Ghash can be, if you buy low and sell high.

If you add the profit  from your cloud mining to your profit from selling your Hashlet / Ghash you might ROI if your timing is good.

In my opinion you have to try it, to learn the concept and lingo and to contribute to the "Mining" part of Bitcoin.

Not everyone can afford to have a data centre in the back yard, but they can have someone else do it for them. 

Try GAW they nice.