I think there's a contest going of who can post the most freebies. I've never posted any. Why? I've seen too many posts of people griping about the quality and/or the hassle they went through to get them(meaning they didn't appreciate it and expect something excellent for nothing). I think the quality of freebies has gotten better in the last few years (steadily) and some claim they'd rather post their work as a freebie because it's too much hassle to be a merchant. 

I think the best way to do it is as a bonus with a purchased product and I love getting added gifts in a product ; so this draws people to spend and eliminates dead beats who complain and burn up bandwidth over something they didn't spend a dime on.