I wouldn't have thought to be in the minority when stating that I actually read a lot of foreign code out of curiosity. Especially when dealing with architectural decisions, I like to dig into codebases I consider to be good and professional (a rarity in the professional/proprietary development world unfortunately). For instance, reading the chromium source code or mozilla for that matter, give you a lot of good input since both codebases are sufficiently complex and deal with a lot of layers and stacks.