Back in the day I was one of the "no to pro team kit" as I was a junior and saw them as something earned to be worn when you were a pro ...
Now later in life I think people should wear team kit to support the clubs/teams they like, just as they do in soccer (football). If cycling had the same level of team fans buying 50 quid jerseys every year the pro teams would have much better budgets to work with and even the smaller clubs would be able to be better funded, but sadly we are our own worst enemy here, perpetuating the idea that it is wrong to wear team kit.
It's the "Pro-sers" the keep this sport alive and fuel the industry, so I say let them buy team issue this, special release that cause it keeps the figurative and literal wheels of the cycling world turning.
And really cool team kit will sell. I've seen so many people here wearing Rock Racing kit (in Belgium no less), just because they found it really cool. Say what you may about the team, but the kit was(is) really cool. Even my good friend who started cycling for fun went and bought water bottles, gloves and the hat of the team because he liked the look of it (he would have bought the jersey and shorts if it wasn't so expensive).
So I say, where it and don't make fun of those who do (unless they actually pretend to be one of the pros on the team, then by all means, shame them into their place).