You're probably right, but there are reasons why one might list a nominal price, but not actually collect payment.

I've listed things on Craiglist for a small price but not collected the money. With free items, "buyers" can be more flaky, and I don't want to deal with that

but by placing a small price, people seemed better at showing up to pick stuff up on time, etc. So, list a price, and then reverse bait and switch when they arrive to pick up item and give it away.

For these, I could imagine wanting them to go to a good home. With no price, you may get frat house pranks, etc., so a small price gets people who are actually interested.

Or...yeah, you're probably right.