I would not buy any GPU with only a 3 month warranty. No display connector of any kind also ruins the resale value. Any "mining specific" GPUs that I have seen so far have been roughly the same price as "gaming specific" models and equal in performance, so there's no reason at all to buy them imo.
One reason I can think of is actually using the 19 slots in the Asus motherboard. For what I've heard you can only do that with these cards (that have no video). Other than that, maybe I need to rethink it 