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The same reason most raid drops are BoP
On one hand I would love to be able to purchase mounts that I cannot get lucky enough to drop, but on the other, it takes the rarity away from them. If you spend months farming one particular mount just because you reeeaaaally want it, finally get it and the next week blizz says "oh hey all dropped mounts are BoU now" you would be devestated. You spent months or even years farming this particular mount that any joe blow brand new to the game can come in and purchase. For me making them bind on use takes the fun out of showing off a rare mount.
And as several people have already mentioned, the poachers would get out of hand simply because they want gold. It takes the reward away from waiting or trying to do something difficult or time consuming.
"It takes the reward away from waiting or trying to do something difficult or time consuming." i rather have a Few K then most mounts in my list tho.. so that would be my reward
While I hate the RNG behind some mounts, often the journey of getting a mount is part of the fun. Also, rare mounts that are not buyable give people incentive to go back and re-experience old raids, where they otherwise wouldn't have any.
i read somewhere that the first ever sky golem sold for like 220k, so if you are fast enough you can sell before the plummet