Your point is well-taken, but I don't think your analogies are exactly on-point. My reference to greed was aimed at Universal, not the guest. I don't blame people for buying Express Passes if they can afford them. I blame the Park for cheapening the value of a general admission ticket as a result of offering the Express Pass in the first place.
Admission to a theme park typically includes the right to ride all the attractions for free to your heart's content until closing time. By requiring payment for an Express pass, Universal has said that you can't maximize your time on the rides you paid to have access to unless you pay extra. That's cheap and greedy, IMO.
Your food/drink/tattoos/souvenirs examples are a bit different, because you haven't paid for those extras with your admission, and you have no expectation of getting any such thing unless you pay for it.
Now, I may be wrong, but I'm guessing that very few people pay the money to get into Universal without some expectation of going on the rides -- those are the lifeblood of the park -- without the rides, the park would not exist. You might view this Express Pass as simply a way for a guest to maximize the park experience. I view it as cheapening the value of everyone else's general admission ticket. I much prefer Disney's method of free fast passes for those who plan their days properly.