Earlier quoted context omitted.
You are massively underestimating. Zynga did $500M revenue in 2010 and PopCap did $100M.
PopCap's games are extremely well known and particularly suited to mobile platforms like phones and tablets. If anything I'd say EA bought them for a steal, they are likely to earn back their buying price and more in only a few years.
Sounds like it's about a 10x revenue buyout. Seems right on the money.