and if you tell me that "how about if they will spend it in auctions or hats or custom" the answer is very simple, when they spend the gralats they got in that refunded gun which is lower % than the original price they lose more.
when they spent it in auctions. they need to add more gralats since auctions go 100k gralats nowadays and winning that auction will get their money and not being to refund it again. which means no more gralats for them that will temp them to buy more packs.
The main point here is that since when you keep refunding guns you will get lower and lower till you need to buy more gralat packs
The problem for most of you is that you just look on short term effect of gun refunds that when you refund you will just add then buy again. How about think on the long term effect that if you kept refunding you will keep losing money.

And to be honest there is no reason for them not to make gun refund system. Jobs are nerfed soo bad(the car mission) that you need a very long time to earn that will make us buy gralats packs.
Stefan's just ripping us off and you guys are just letting it continue