Quote from: EskimoBob on October 29, 2013, 06:51:48 PM

Will someone cleverer than me please work out the breakeven purchase price for a Blade given current difficulty and compare it to the last sale prices for the same hardware. That'll tell you what 500TH of these chips will be worth.

ex-trader, http://mining.thegenesisblock.com/ will help you with those calculations.
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Thanks - I had looked at that and I'm very impressed by the site. My problem is that it seems that the rate of increase in future in the key to ROI calcs and as is stated in the post by rival thats voodoo at best.

It certainly seems to me like nothing you can buy right now can make ROI when measured in BTC, in which case the logical buyer should just buy BTC instead.