That's the reason why I only buy hardware with the profit I had made with mining.

Beside all my Nvidia cards I have 30 x R9390's mining Ether. I try to mine at 3 different algo's

Originally I was mining Dash with "used" R9290's wich I sold after 1,5 year mining for 100 euro each.
So all the hardware I use mining at the moment I will sell within a year as "brand" new.......