collectors plates...what's the deal?

I have a bunch of these some autographed, some not. I know they were popular in the late 80's and early 90's but what about now? Are they worth anything? The ones I see on ebay don't look like they are selling and if they are not for much. Are the autographed ones worth sending into PSA/DNA?
I'll eat off of them before I sell them for 5 bucks!
I'll eat off of them before I sell them for 5 bucks!

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I picked up a Hershiser about 15 years ago at a discount closeout store; it cost hardly anything and it's probably worth about the same.
On the subject of plates, I like this one:
"All evil needs to triumph is for good men to do nothing."
I have some that are auto'd by DiMaggio and Mantle, do you think it would be worth the $75 to send into PSA/DNA?
They are nice collectables but the thought of collecting plates and hanging them up is a little silly.