I think this would be market/area dependent. For instance, bbq equipment on CL in Houston is pretty slim pickings whereas Dallas CL constantly has all kinds of cookers come up - Weber, Big Green Eggs, etc.
Some areas may have people less inclined to build UDS' themselves. For instance, IKEA products are specifically designed and packed for self pick-up and self-assembly, yet there are a good number of folks who pay to have items assembled (my wife's cousin is one of them).
EZ wood handled 3 wheeler | OTS | OTS mod to OTG | Ladybug SS Performer | UglyDrumTandoor | UDS v1 | midi UDS with red nipples | SJG smoker mod | Simpsons SJS | Simpsons OTG | WGA charcoal | SJP | Stacked brick WFO | Lodge Logic Sportsman's Grill cast iron hibachi/sigri | LBGE | sbge | mini bge