Hi Jay, The insurance side of it does make up 99% of their tracer gas work, I've only ever done one private job for them. The trouble is most people are not aware of tracer gas so most of the time if there are no evident signs to go on its just suggested to excavate the floor. Are you looking at the Sewerin kit? Theres deffinatly good money in it if you can get the work. I said it was boring but it doesn't help that the company I helped with this were obviously inclined to tracer gas every job as they get paid good money for it, even if it was clearly obvious it wasn't needed (i.e dripping PRV etc) or it shouldn't have been the first course of action and a wet test done first. The trouble with the tracer gas is due to the nature of it being gas and very compressable you can still have a decent leak but it would take an hour to get a drop on the gauges so its always worth sniffing even if theres no drop, but yes ideally wet test first.