I whole-heartedly agree with this....if there were more insentive for not just Builders....but Scripters as well....to development more great content for SL, perhaps 90% of those accounts (which are really dead/alt accounts) that Linden Labs claims to having would be used more. If sim owners could purchase different tiers of SIMS at lower cost, that would be dedicated to building, scripting, and/or RPing with development through builds and scripting systems, Linden Labs would have more sim owners paying for sims.
Expand this idea to include scripters, however. Without great scripters, the buids are just build that wow the eye. Add scripts to the builds and you get interactive content. We do need games with in SL that need land (some that need as much as a entire sim) in order for the "residents" of SL to play.