[droithomme]

Lots of people do this and there's nothing wrong with it, but I think it's best to have up front pricing rather than "contact for quote".

One way to do it is have the Enterprise version have a few more features that are unlikely to be of interest to small companies or individuals.

Another is just to say the company size on your pricing page. If your company has 500+ employees it's $5000, if 1 person it's $50, if 2-10, it's $200, if 11-499 it's $1000 - or whatever.

Can also have per user, say $100 per user, but a single location site wide license for $1000, or a global site license covering all branches for $20000.

Or whatever prices you like. Look around and you'll find tons of companies offering each kinds of licensing.