do not buy on the same cloud.zenminer.com account both Scrypt and SHA-256 virtual machines...
Just use 2 separate accounts...
In fact, BTC difficulty is increasing very much (15% - 20% difficulty increases every 10 days), and by few months, you could loose a part of Scrypt mining profits, just paying SHA-256 maintenance fees...
Anyway, I think too that most probably the mining farm should rebate maintenance fees according to market situation...
But it is better to be careful...
What's the benefit of using two accounts?! Maintenance fees at GAW Miners will be adjusted downward (n their words: "adjusts to always remain profitable"), so based on that there's no risk of losing scrypt coins to SHA256 fees.
On top of that, and this is quite a biggie, the Hashlet Genesis is a Hashlet Prime, so you can (in the near future/weeks) switch from SHA256 to Scrypt mining and back again.
The genesis isn't a prime, it can't switch back. The prime can switch to genesis and back though.