Limited User Concept

The limited user licensing has never made any sense to me. A 3 table limit (outside of those allowed ones) seems arbitrary and not functionality-based. Just enabling a user to create sales quotes or orders could go over the limit depending on related tables being updated. I think it's safe to say, though, that if you will have users creating quotes or orders as well as updating a couple master records (customers and contacts), you'll be pretty clearly over the 3 table limit. Again, I think it's an arbitrary number with the implications half-thought out. We're generally quoting limited users for read-only users or users that will ONLY update a couple tables (customer, vendor, etc.), but as soon as the users get into any functional areas (creating sales or purchase documents or anything transactional) we're assuming they'll need full licenses. I don't want to have the fun conversation later with our prospects/clients that would be necessary otherwise. "Well, we THOUGHT you'd be okay with the 3 table limit, but it turns out you're updating 4 tables...so you need to pay $2,400 extra per user license now to upgrade those to full ones." Then again, some partners that lowball to land projects will close more details by "assuming" the cheap license will be fine early on, and then tackling that additional cost later once the client is fully committed to the implementation.