[lotusleaf1987]

Why go to that effort? Did you really save any money, or more importantly time/effort? Paying for the shipping on the other books alone would seem to negate any higher profit margin that resulted in not having to compete with their prices.

[jacobolus]

Probably because hacking systems like this just to see how they work is inherently fascinating.

[gibybo]

Except now he has five copies to sell instead of three, and he can sell them for much more than he paid for the two from the automated sellers.

[rwmj]

He's cornered the [Amazon] market in old textbooks :-)