Condylactus are from the Atlantic. Clownfish are from the Pacific. Normally they wouldn't encounter each other (in the wild) and the Condy is not a host anemone. Occasionally, clowns with a strong hosting instinct will host in them (ie Clark's, occasionally Maroons etc.), but that's the exception, not the rule.
Condies are known to eat fish - but any anemone can and will eat fish, given the opportunity. I've even seen a BTA eat a Clark's clown when the startled clown dove too far into the anemone and inadvertently got swallowed.
Feeling 'sticky' *is* the anemone stinging. The skin on our hands is usually tough enough to not feel any adverse reaction but if they catch softer skin (back of hands, arms etc.) many people get a rash (myself included), and if you're allergic, best do whatever you usually do to take care of a reaction.
Condies are probably cheap because they are abundant and don't have to travel too far to get here - from the Caribbean vs. the Indo Pacific for other species.
For what it's worth, a Caribbean importer who posts on an industry board I frequent mentioned that after the recent cold snap in the Keys, Condies (and emerald crabs) were among the hardest hit by the unusually cold water/weather.
Condies are reported to be a lot more mobile than other species - in my experience they aren't any more adventurous than any other specie can be. They do tend to eat fish more often than some of the other species that are commonly kept, but I'm not sure if that's because more people buy them (because they are cheap) and as such there may be more "out there" or what.
They are fine for what they are - ornamental in a reef. Too many people make the mistake of expecting them to be a host anemone and are disappointed when that doesn't happen (it does happen occasionally as I mentioned above). I personally don't stock them, but I had one in the shop for close to 2 years when a customer brought it to me after it ate several of her fish. It didn't eat any fish on us (and we did keep the occasional fish in the same tank)... but we kept it well fed.
Jenn