One thought to keep in mind is that much of what's on the market is distressed housing -- short sales or foreclosures. In our area 70% of active listings are short sales and forclosures. If it's bank-owned the banks won't spend a penny more to get the house sold. And, if it's a short sale, what are the chances someone who can't/won't pay their mortgage will buy carpet cleaning for a home that, short of a miracle, will probably go back to the bank anyway?
Right now it's all about price. If it's priced it right, it sells. If it's not, it sits. If it's not a distress sale and the owners aren't willing to take a beating, clean flooring may or may not make much of a difference since buyers can find a comparable or better home in the same area for thousands less.
If you work with agents and they're not calling I'd give them a call. Find out how they're having to adjust. See if you can figure out what makes sense from their perspective.
Just a hunch, I wouldn't focus so much on trying to get everything in the house as I would on being a problem solver. I'd approach it from the "every listing has an eyesore or two, and whatever it is, I can help resolve it painlessly and affordably" angle and see where you can take if from there.