You are allowed up to 2 posts of a type in customs (custom, question, etc) on the front page. When you get to 3 of a type, they are merged. We were having issues with the entire front page of customs being taken up by a handful of people and it became excessive. Others' work was getting shoved off the page and not seen because one person (not a specific person, but in general "person") would make individual threads for dozens of customs or questions at once. So it was decided they would start being merged so everyone gets a chance to show off their work.