While I like the concept, the prices are very high. With a 1070 rig (I don't know the hashrate you are guaranteeing with those... I'll guesstimate 32Mh/s) it would take you a long time to pay off that rig. Considering difficulty rises I'd say it would take you 24 months to break even. You'd have to be gambling that ETH will go up in its worth quite a bit to make it worth it at these advertised prices.
Hello,
the price is high because all components is hard to get and also all cards went up like crazy. Also i do belive now is the roi around 12 months. But you dont take in cosideration folowing: 1. The hardware is yours so till its in warranty (usually 3 years) it has value and the value is not 0. 2. The price of ETH or ETC can go up... 3. you can move to other currency like Zcash or some new commers

Best regards
Invictus Mining Team
Understood, I realize you have to have your markup. I would just caution new miners who think that their income will stay the same over the amount of time you are paying off the rig.
Do you monitor all rigs, manage them, and only provide the profits to an ETH wallet? Or do you allow the user to log in and manage it themselves, either through a portal or some other mechanism? I'm trying to understand the value added by the maintenance fee. It might be worth it if we could point the miner to our own preferred pool or target different algorithms that might be profitable versus ETH.