What should happen? An invitation to Pachter's has no real value (as in: you aren't actually causing any significant costs by visiting Pachter), so I'd assume that those people would get invited regardless. I doubt Pachter is the kind of jerk who'd say: "Nope, you only paid $2.000 before we closed the Patreon, no invite for you!"
I wonder what happens if you've got to stop your contribution halfway through, though. Being left with nothing after you've already paid several thousand dollars would be pretty bad -- I don't think using Patreon to pay something in installments is a smart idea, honestly.
I don't quite understand what people expected. People told Shane for months that he should use Patreon as it's supposedly a great platform for this sort of thing. Now he's started a Patreon and all of a sudden people are surprised that running a proper business costs a ton of money? Well, duh.