Freebies are great. To be honest, I guess I’ve never really used a freebie (except for icon sets). Furthermore, I have no idea who uses them, but apparently a lot of people, and thats why I make them (and, I think, all the other "designers" too). In my opinion, it is awesome to see how other people use the stuff you made, tweak it a bit and make it to something completely different.
The most of the time I spent thinking about what I should create. A very important question you have to ask yourself is "Does anyone even need that?". I mean, sharing some login forms or setting modals isn’t very efficient, is it? Of course, they look good, but if you create a whole product/website you can make that by yourself, right? Something that matches together with the general UI. I hope you get my point there.
Freebies have to be individual and original. At least I think so.