Are they going to do that? It would be dead nice of them if they did but I'll go for a no.
When you buy on some bullshit cloud mining service like Genesis Mining, they give you contracts to buy X number of MH/s, GH/s or TH/s. With Hashnest, you buy the machine's hashrate and the fees they charge are maintenance costs.
With some crazy crypto rallies preceding you buying the contract, I would say that it'll be completely shit within a month or two. Regardless, Genesis Mining is a load of crap and within a few months they'll be charging you more than the amount you earn. Considering that they try to hide how much they actually charge, you'll probably end up losing a lot of money in a very irritating and complex process.
tl;dr: just buy.