I don't object to anyone who wants to use registration to control bandwidth, as long as they don't use your email improperly. As someone mentioned earlier, the problem is that as more sites begin to do this, users are forced to deal with an ever growing collection of usernames and passwords. You can use the same ones everywhere but obviously, that's a bad habit to get into from a security standpoint. Microsoft had the right idea with Passport, but a lot of people have various objections to using it. It would be great if there were a centralized authorization system for Poser sites. Perhaps Renderosity could start something like this and charge site owners a small fee join.

"Democracy is a pathetic belief in the collective wisdom of individual ignorance." - H. L. Mencken