I believe it's two sided. And I'm not trying to cause any drama by posting this, just my opinion.
I understand we have a dealers section, but it seems like many members on here don't go looking there when they want something. Yes we have a search option, and a dealers section, but they'll just post in the WTB and wait for the offers to come in via post or PM.
Posting in the WTB with a link or notifying via post the potential buyer of X product is the only way some dealers make sales.