to assume that this is purely a financial problem. (Just as it's dangerous to assume that this is a 'jealousy' problem.)
First, the Afghans didn't attack us. They may be poor, they may be playing host to bin Ladin and the Taliban, but they weren't on the planes.
Those were (for the most part) Saudias...and the Saudias Royal family has the money to buy SUV's and computers and whatnot.