Re: 'Secured'
8 of them for $27.92 per hour means $3.49 per GPU per hour.
If they manage to rent them out 24 hours per day for 365 days, they get $30,572.40. In the following year, it is last year's model of GPU and they won't be able to charge so much for it.
That means in the best-case scenario, they can maybe earn back the cost of the GPU, not the computer it was attached to, bandwidth, transaction fees, data centre running costs, maintenance, electricity, cooling, sales staff, advertising, loan interest, etc, etc.
I would be expecting to see full investment pay-back at the end of year 1, then whatever you get in future years is profit.