Well right now no miner on the market will Roi in btc.
That isn't true at all. OP is selling these things, he owns them, he can sell them for whatever price he wants, including one that ROIs. If he wants to.
Taxes have nothing to do with it. Spending 4.11 BTC now to get 2.5 BTC later is simply not a good deal, no matter how you want to fudge the numbers.
Anyways, I'll stop cluttering up the sale thread. OP, if you are willing to sell these things for less BTC than they will generate in their lifetime keeping in mind that you get the money up front and don't have to wait, and all risk of not getting the BTC are removed, send me a PM. If you are looking to sell these for more BTC than they will ever generate, good luck with the sale.