I shouldn't have too say much... but lately there has been a couple people filling up entire /ah pages, full of re-named blocks/items advertising their shops/warps. I (and a lot of other people) would appreciate if there was a max amount of items you can put up on /ah.
Definitely support. On Skyblock depending on you're rank, you can auction a certain amount of items. This should be implemented on Survival.
Getting this sorted now, I've got the person who flooded ah with their dirt to remove most of them. As for a limit itself, it should be added real soon.