You are probably right, Jeff. It is very true that most people are focused integrations and extensions, rather than styling, myself inclusive.
That's why it would be really nice if there were a bit more out-of-the-box themes to relieve us of this 'burden'. Especially now that Alfresco has a self-service cloud offering there will be more customers/users that stick with the default themes.
Also having more color schemes to choose from helps when creating quick demo's for a prospect. Some time ago we showed a PoC of a DAM system based on an out-of-the-box Share app to a retailer in garden supplies. After choosing the green theme and adding their logo the site looked remarkingly similar to their own brand style.