"Pay To Keep Up" (Discusses Cosmetics Only)

So a quick scenario that came into my mind.

Say Intrepid offers some limited time content, some 'thing' that we have about 3 months to do, and after that it will either disappear or not give the standard rewards that it was giving for the first few months. A special event.

Then that special event gives an ingame cosmetic as implication that you managed to clear it within the timeframe. Could even be from something instanced, doesn't matter.

Then they sell a SIMILAR but not entirely the same cosmetic in the shop after the limited content closes, for those who couldn't finish it or who weren't even playing yet at the time, maybe, but can buy it much later on.

Any opinion?

I couldn't care less about cosmetics, but I will be participating in all the events of the game cause I'm an achievement hunter. So to me, as long as that buyable version has at least a single spot on it that visually differentiates it from the event one - I'm good. What's the point of showing off what you've achieved in the game if someone can just buy the exact same thing for money.