You're right, but money already is involved in these articles. Authors and actors (and agents, I've suspected in a few cases) are keeping a biased eye on their articles.

I think it would be difficult for Wikipedia to be corrupted by money. There's too much transparency, and there's too large of a community. The admins have already discovered with dealt with large-scale attempts to game the system.

What's actually at stake here is the appearance of objectivity. Affiliate links, which are nearly universal across the web, should be minimally objectionable.