cause eth mining stops this summer and 7990 is going to be relic. i agree this is a bad trade for titan sellers considering titans are still decently profitable for the kind of hashrate it delivers at insanely low power rate. titans are priced based on basic demand and supply law and lowballers are usually the first to bail out. on the other hand A4 is still months away cause "Mass produced A4 ASIC/Miners will be available in June/July 2016 based on pre-order sequence." so you still have full 2 months to mine and probably another 2 months by the time difficulty ramps up so you can easily break even by the time price of bitcoin may have risen by at least 50% whether before or after halving.
Why is really bad trade ?
A4 is coming so titans are dead .... the overprice titans can be door stoppers finally