I bought into this a few days ago. I only bought 100 GH/s because I have this feeling that I wont really make anything on it. In fact I would be happy to see just break even in 5yrs. It all depends on the difficulty not increasing drastically I think. This term it doesn't look like it is predicted to be a big increase so I shouldn't see a big drop per day. If we get a few terms with bog increases I may not have any chance to ever make it back. Either way it will be an experience that I will learn from one way or the other.
This is the problem with buying such a long term investment in cloud mining or any type of mining for that matter. As it is now the difficulty is doubling roughly every two months, in other words your expected revenue is going to half every two months (assuming that your provider does not charge any kind of ongoing maintenance fee, if it does then your drop will be more every two months). The later part of your contract will see very few results.