You're sort of describing me. I've got a course at my house, but for aesthetic reasons I'm not all that interested in tearing up the grass to either make or pour teepads. I've got a UTV and a tractor, and I've got a trailer. Most rounds are just me and whoever is playing with me (sometimes big groups, but we just play mob golf if so), not multiple groups. I've toyed with the idea of building/buying a teepad that I can just put on the trailer and then drive to each location to tee off as we go (we've almost always got someone who is there to watch who drives the UTV anyways).
But then we get to cost, and I could just build this myself for a fraction of the cost. I wouldn't want to build a dozen of them...but once you're looking at buying a dozen, then the actual $ difference is so vast it's not worthwhile either.
The only customer model I can think of is someone who NEEDS the portability. So someone just traveling around with a semi full of pads and baskets making temporary courses each week at random locations. I'm not aware of anyone in that customer profile though.
I'd probably buy the big version for a few hundred bucks to have one...I don't see how any are selling at the current price point though.