It almost seemed like, when I first came to TMD, the website itself was a "team" of sorts for the regular posters.
I agree that the membership structure isn't doing what it used to, and it relates to this quote. In 2003, when I was a newcomer to TMD, I was excited to be in a higher user group because the overlap between those users and the leaders of the format was very, very high. The high-level users were virtually all super-active and so very visible. Just check out the
post counts. I'm still #19 five years after I've done anything relevant. All the other factors discussed in this thread have eroded that "TMD is your team" spirit, making status on the "team"---and thus posting---less recognized as a rite of passage.
Also, Tito del monte is completely right about EDH being the go-to play-with-anything format. Legacy is for Spikes; EDH is fun for anyone. That leaves Vintage in an awkward place.