I too initially shared Gray_Area's objection, but Eliezer did in fact address it:

If you need $24,000 for a lifesaving operation and an extra $3,000 won't help that much, then you choose 1A > 1B and 2A > 2B. If you have a million dollars in the bank account and your utility curve doesn't change much with an extra $25,000 or so, then you should choose 1B > 1A and 2B > 2A.

The comments introducing the idea of a lifesaving operation actually clarified why that objection isn't reasonable. If I need some money more than I need more money, then I should choose 1A > 1B and 2A > 2B.