Currently, on WoP US it is, not on other sites that I'm on. I don't know about DE.

This could be really helpful if you open a bunch of wizard cards and you don't want a post on your wall get moved down, so you can pin it above the rest.

Bumping this because this would be great ^^

Those ads should be removed already, but if you get them again in the future, there should be an option to report the ad on the ad itself (usually in one of the corners of the ad).

Quidditch team members also change often and some are only reserves, so they don't play as often as the rest of the team. Some team members also aren't as committed as other players.
It should be up to the captain/HoH to reward the team members as they feel needed.

MoMs can't change whether the club is accept only or if all can join sadly. They'd have to delete it and make a new one, which loses them everything inside and all the people in the club. 

I agree ^^

I've encountered this before. It's when you open your last card on another tab, so on your current tab, it still says you have one, but you truly don't, and you attempt to open said card. It can't show you got anything, because that card doesn't exist, but it still goes through the opening animation. If you refresh, it'll show you have no cards.

Most teams do have a separate Quidditch captain, and most times, they do get paid as a journalist for the house noticeboard. If your site doesn't have that, I'd suggest talking to your Head of House or Minister.

This is also an issue on WoP US :)