If you don't need it - Why have it?

I'm thinking about resale value. Will buyers expect double sinks?

Depends on your house - If you live in a cottage or an MCM Ranch, then few will be put off by the lack of a second sink...
...but if you're in a neighborhood of much larger houses - assuming you're not in an area where everything is being foreclosed on anyway - then it might be an issue.

Good points. It's a condo designed to appeal to empty nesters.