Because of the antics of a few that proceeded you, it became a necessary evil for such restrictions to apply to all new comers.
You've been here just about 3 months, but haven't posted much of anything, not even an introduction in the New Members area... when it comes to using the Buy/Sell/Trade forum, members like to know who they're dealing with, and the way one conducts himself/herself with his/her chosen words in his/her postings is usually a good indicator of his/her character.