Not to be argumentative, but just because you don't have a compressor doesn't mean that nobody needs one. Otherwise, there wouldn't be so many sold every year.
More and more home compressors are selling every year because of the slow decline in dive shop air quality and serious increase in fill costs. While there are a lot of very fine air systems out there, junk air can still be had in almost every city with two or more dive shops. Additionally, more divers are diving a ways from their home shop and taking a dozen tanks to the camp ground for a weekend at the lake just doesn't make sense.
Oh ... and it is compressor owners that are sending stuff in for service ... not non compressor owners.