Is that pump itself not worth it?
I know people who are Federally Prohibited so air rifles are their only choice.
A few are very deep into PCP so a $$$$ compressor makes sense especially if you are filling tanks for others.
Think about what tou spend on ammo/reloading
Think of a air compressor as renewable powder source?
mac1911, agree. Some of the newer air rifles are ridiculously accurate out to 100 yds, and with the new slugs and barrel sleeves designed for them, 2-300 yds is readily do-able. For me, it was pure convenience. I can shoot 50-100 yds in my backyard with my PCPs without bothering neighbors (and they are easily bothered - grin). Not unusual for me to run 3-500 pellets a week. The Nomad has made that almost effortless, and compared to getting a scuba tank filled, it's paid for itself over the last couple of years.
Only caution for your post is that I wouldn't count on a pump like the Nomad (or comparable) for regularly filling tanks. I can fill my PCPs directly, and I fill a pony bottle with it for long sessions. compressors designed for refilling larger bottles, or even pony bottles regularly, run a bit over a grand (or more).