I've only had three recumbents for the last couple years, and people ask about them a lot.
I say they cost about a thousand originally, but I offer that the cheapest ones are around $600 new and the expensive ones cost way more than mine. Also I note the two local shops that sell them.
I'm a pretty large guy so I don't worry about anyone trying to make off with one in front of me... When I'm out riding and there's other people around (such as at a convenience store) I lock my bikes to something immobile whenever I'm not standing RIGHT next to them.
Friends, co-workers and family knows because they've already asked.