I played Vintage from 98 to 2003 competitively, then sold out, mainly to Trinisphere. Came back in 2010, and was like first thing first, time to buy duals, what $40-$50, nope, $100-$300. Well, can't do that. So alternatives? I was going to proxy events, but even winning, it felt odd. Can't afford it? Shouldn't play. Wtf is up with those 4th edition factory? Why you proxying duals but got foil fetches? I just got tired of being "that guy". But with old school? I can build an entire rg beats deck with no Taiga or power for under $20 and be competitive and have fun. Prodigal Sorcerer's, Air Elemental, Boomerang and Counterspell? Done and done. It's actually easier to get into a revised old school deck than any Vintage deck, and I don't have to worry so much about elitism. It's more fun, cheaper, and def more nostalgic now. Outside of Duals, power, and FoW, what is even used from old school in Vintage? Moat, Abyss, and even Mana drain have fell to the wayside. With power creep, it was essentially Khan's block with p9 and fows and duals for awhile.
Families, age, money, and nostalgia are why Vintage, in paper anyways, is slowly losing ppl to old school imo.