<sarcasm>Why stop at 2,000? Most of the creative people in SL won't be able to afford that for every mesh, so why not really limit it to the corporate drones, and make it 2,000 per vertex?. </sarcasm>
2k per mesh is not unreasonable only if you are making money off of it. Most of the people who are making products in SL (yes, there are some notable exceptions) are losing money. I don't understand the point of taking yet more money from the poeple who are making SL a place that people want to sign up with. If LL wants to attract more people to SL, they should think about finding ways to support content creators, not impede them.
I think the point you are making, however, is valid, however. By making it prohibitively expense to develop content on SL, we can effectively either stop all but the very well off from developing content in SL, and forcing them off SL to develop content for InWorlds and other grids instead. I just don't think that is a good idea.The idea here is to grow the user base, not shrink it to death-spiral numbers. To do that, you need to have some kind of content to attract new people.
Of course, your mileage may differ.