If a man experiences some one-off luxury, he'll appreciate it and then go back to his previous lifestyle. If a woman experiences the same luxury, it's more likely to simply whet her appetite for it, and result in her demanding it continuously.
That is a gross generalization, and men are just as likely to continuously demand the "better lifestyle" as women. Bigger cars, more bling, all that. If you're going to compare the "spoiled princess" type to men, use the male equivalent. Otherwise, it's apples to oranges.
Without society keeping this desire to be provided with things in check, women will simply demand more and more until the economy can't deal with it.
Completely baseless. Evidence for this? A small percentage might be like this, but some cultures actually encourage the "bigger and better" temptation... see the US, for example.
Whether he's right or not is up for debate (not being everyone, I couldn't say whether it's true), but the point is about women not settling for less, not about female sexuality.
And the point is still wrong. You and the OP basically make the claim that a woman will not be happy with (to use the available example) a man with a smaller penis than her previous lover. This is patently untrue; size (or wealth, or societal station) in a partner matters a bit, but not nearly as much as technique, intelligence, compassion, and overall personality. I know this firsthand. I'm in a poly relationship; my female partner has another guy who is better-endowed than I am, but she enjoys us both equally. Why? Well, it's about individual "styles," as it were, as well as our personalities that she finds attractive.
So, basically, the OP does NOT have a valid point, and your defense of him is flawed. Any of our female members (those that happen to be attracted to males) can likely back me up on this.