In my experience, vendors here fall into three groups: products that some find useful with reps who add something to the board (e.g. Dragon, Updox); spammers who just try to push a product-which may actually be legitimate; and finally those who sell something like jewelry or kitchen cabinets.
If they are in the third group, don't let them in the door.
It can be hard to tell the first two groups apart at first glance. So let them in, but toss them the minute they become annoying or pushy.
Just my opinion.
