If you’re a new player, you won’t know the difference between a 3 star perk and 1 star perk. You build up to it, so it only feels better as you rank up. I can imagine a new player boasting a 3 star jetpack recharge when his teammates are not wouldn’t be thinking too much of it and be many meters in front of his team. They might not understand jetpack management like a higher level would, or just be physically incapable of keeping up with their 1 star, and it would probably feel crappy and turn out badly.
How about a low level monster player running the 3 star damage perk against a Hank or Val with only beginner (1 star) on his gear? A newbie 1 star monster fighting against 3 star damage reduction, or 3 star movement speed/jetpack/reload (dome) Trapper?
It just seems like something that could make learning the game more frustrating than necessary. It’s a nice idea, but I personally don’t think it should be a store option.
And like others mentioned, when this game is already bashed for its DLC and other in-store choices after purchasing the game ($60, or maybe $30 on sale, for the game and then $2~$5 for any skins you want and $25~ for every new tier of characters). I do not mind the costs myself, but many people do. If they saw something like that, no matter how cheap, it could reflect badly.