First of all, I'm not going to be doing the donation thing to the author - I've heard you guys, and you say no.
Ah, cool. Thought it still stood for debate.
Does that mean the biggest? No. I want quality stuff, not mediocre or bad stuff.
But how do you define "quality stuff"?
Add-Ons can be regarded as a piece of art, since they are highly subjective by incorporating a designer's philosophy and maybe even part of his/her personality.
Art is a highly subjective matter, others won't like what you like and vice versa.
Take Premier Aircraft Design for example. Some people like their models, because they're kept simple and user-friendly or because they've modeled a plane fans have been waiting for a long time. Others though, find PAD's KISS-philosophy and their low-res textures not appealing at all.
What are you going to do about that? Refuse to host those aircraft because they depict a simpler approach to realizing your favourite aircraft for FS?
Next example: Project Opensky. Beautiful models, great textures, but VCs as usable as a piece of lawn. Are they going to be hosted? You bet they are, because they're good for screenshots.
Where do you draw the line then?
Is it enough to look good to be "quality stuff" or do you also consider things beyond optical properties, like usability and flight dynamics?
I want you to be able to see big screenshots of the product, not little thumbnails.
That's always good, as long as the screenshots are representative, say depicting both exterior and interior of the plane.
Don't forget file descriptions. If the author didn't submit a good one, you'd have to write one yourself.
I'm even thinking about actually taking the time to install the product, make a 30 second video of it in action, and posting it as part of the description in the library. Who else does that? Isn't that something people would appreciate?
I wouldn't use that feature, but it would definately make your site a bit "different" to the other ones.
And I don't charge for any access to the library, by the way.
That's the minimum. I wouldn't join a site charging for freeware.
The unlimited download speed sounds good as well, but make sure your server is well connected to avoid chokes during peak times.