Yep, it's normal and apparently they can gobble huge amounts too without a problem.
I will never forget the time my guild did one of the Ilshenar champ spawns. We finally finished it and had just finished piling up all the gold into one pile. I was trying to move the pile so it wouldn't poof (was still kind of new at the time and didn't know how fast decay would set in) and realized all of a sudden it had disappeared! Looked back in the journal, saw the message saying my WW was happy, and realized I'd accidentally dropped the whole darn pile on the WW. I felt sooo silly and can only imagine how some of the more experienced players I was with were laughing at my noob mistake (that, or shaking their heads). Damn greedy wyrm!
