Why the F does anyone buy ASIC when you can move on with a GPU to new algorithms and keep your profits consistent?

ASIC resale value in one year 10% of original cost
GPU resale value in one year 80% of original cost

Don't think so? Look at the suckers on eBay trying to sell their Jalepeno and Antminers for a ton less than they paid already because they barely make $1/day. Look at 2 year old GPU prices on eBAy, min 80% of MSRP.

ASICs arrive when the seller is sure the difficulty is increased enough for it to be worthless for the SELLER to use them, so he ships them in a box to you.