This is a wonderful idea, it brings back the era's of PWI where you could tp to west and see a mass of catshops to peak your curiosity by checking them out. Frankly, I do not see any negatives to this and only benefits. I'm sure editing the catshop to accepting 5000 epic coin bars is not too difficult and that is the only requirement.
It would increase online player activity, meaning that at all times server would look less dead and more active as vending would happen in-person instead of just world chat messages. This is very beneficial for the server for obvious reasons.
I personally would love to see this implemented.