I feel your pain. Guests at my motel like to bring over shopping carts from the store across the street (and sometimes from the store a mile up the road!). When I call, they cheerfully say they'll pick them up within a few days. I'll gather all the carts from around our property into one location to make it easy, but they never pick them up. Ever. Eventually, the collection gets large enough that I'll load them into Hubby's truck and drive them back. We then get weird looks when we're in their parking lot unloading shopping carts from the back of a pick-up...

It'd be nice if they had someone on cart retrieval once a week, and if they gave them a truck. I've spoken with employees who've had to walk 2-3 miles to get a cart, and then had to push it back by hand. It made them grumpy, and it doesn't seem cost-effective to pay for that much labor for one cart. If that's how they do it every time, I can see why they don't like sending people out to pick up the carts.