I just did a post on my blog about trying to figure out who my picker was for my grapes. But I also think about how many wonderful things I've purchased at Farmer's markets and how rarely I get decent contact information from the wonderful growers. I remember getting a great concoction in a nice glass jar and keeping the jar around for weeks to return it, but eventually giving up because I never seemed to find the same grower.
I think growers are unwilling to "push" their other products on buyers, but honestly, we don't know you have something if it's not on the table in front of us. So if you have other things to offer, at least put up a sign and give us a chance to say no. And, dare I say it, business cards with contact information, or even a stamp on paper bags giving us a phone number, wouldn't be too pushy. Sometimes we just can't find you again.