Wonder why so little interest in this. You can lock up a guaranteed sales price for devices that are quickly becoming not worth the electricity costs they consume.
People dont like to forecast anything to do with BTC, It's not easy to agree something now which may not pan out in 1-3 months, It's not easy guessing the next difficulty.
It's an admirable offer and a new way of thinking about buying, But for me, Agreeing to sell my 60Gh asic for 6 coins (@0.1BTC per Gh) in 3 months is just not worth the gamble, It could still make 0.2 a day making me the 6 I would make selling it, but then loose out of future revenue.
And this is without the BTC price moving, I cant sell my $1299 unit for $730 knowing that 50gh is selling for $2499.
For me the electricity costs are more than earned by the mining, I can only point out my point of view, I know I dont speak for everyone, But I would struggle to agree on a 20 coin sale in three months deal.
I hope you do get a deal, I would like to see what arrangements are made.