That's not necessarily true. My takings are already at 81% of my expense, and I'm only doing it for 6 weeks. I gradually built up my rigs so average is like 50% for the 6 weeks and still I'm at 81%. It could be 100% allready if not for mtgox...
So resell does not matter for me. If I don't need them anymore then I sell them at a price they buy it. It's a bonus.