Unfortunately, Wizards reprint ban killed old magic.
The reprint ban means a vintage deck will cost over $100,000 using the "cheap" Unlimited cards and somewhere around $500,000-1,000,000 using just Alpha cards.
Even going to Legacy, the cheapest (heavily-played) lands that you need are $300-400 (almost double for good-condition). You need 15-20 of these for most decks which is $4,000-12,000 just in lands before considering any other cards.
You can switch to digital MTG for cheaper prices, but you'll still spend thousands on cards you don't actually own.