Let's bring back the Renaissance-era model of the Art Patron. Instead that twenty-something pull out a roll of bills to buy a scalped sports ticket... get them to pull it out to fund the creation of a sculpture, a song, a painting.

Connect the influx of money and people directly to the creation of the "cultural contributions [that] attracted those neo-yuppies here in the first place". This has the advantage of turning those neo-yuppies into participants in the culture they're here for, rather than just consumers of it.