Yea, if you gonna enable 25HC/Wrathful gear on marketplace, make it so ****ing expensive to get that those who can afford it will be counted by single digits. This would limit the total amount of such gear obtained via store in game, but still cover the costs of what you would get from normal sales since the prices are insane. We understand you have to make money to cover the costs, but if you're gonna release 1x rate server and don't want people to say "Well, **** it", you really cant bundle this stuff with it. If you must, at least make it very rare to come up against such person in game.
As said above, some people will totally buy that gear even with insane costs if it means that they can obliterate everyone in blitzzlike server where 90% of the people will wear green and blues. Make the store revenue from couple of these guys instead of the mass and by ruining the server for everyone.
I would not mind trying to fight one or two full wrath donor in 40-man AV or 1000vs1000 WG. at these numbers, the quantity rules over quality. In fact this could be fun ganging up against one or two such players in large BG's.
TL:DR, It's totally fine as long as the prices are so insane that an average joe can't afford it, and therefore odds of meeting such player in game would be less than 1%
You get the required money, nobody will complain (at least not as much as making this Pay to Win with affordable prices), some dorks will spend their savings to feel overpowering in game, staff gets his funding and people have actually a reason to play and compete against each others in gears and raid progress. Basically everyone wins