One of the biggest problems with these lease deals, and I've talked about it before, is that you're taking on all the risk without getting the full benefit.

If bitcoin crashes hard then you basically lose everything. You don't even have salvage hardware to fall back on. If bitcoin skyrockets then you'd have been better off buying them. So already the only scenario this pays in is if they stay relatively stable and in that case you need some really good returns relative to buying your own rig to make it worth it since you're taking all the risk. Not only do you not get better returns with this deal than buying your own rig you actually get worse.