"50 cents per round for PBs vs. 3 cents per round in airguns"
I disagree with this comparison as it is an oversimpification. First of all, the only 3 cent pellets are .177 "off" brands. Larger calibers and slugs can cost more than lead bullets for reloading on a per unit basis. In a PCP, the pellet isn't the only cost per round. Compressed air is the propellant. The PCP is much more complicated than a firearn and all of mine cost much more than my high end rimfire target rifles. The cost of compressed air includes the tank, the compressor, or the cost of dive shop refills which adds time and travel expense into the equation. Now lets compare powder burner costs. I shoot 90% rimfire rounds and my go to CCI standard velocity .22s cost .07 cents per round and reloaded 9mm pistol and .38 reloads for pistol cost me 15 cents per round. If I add in the cost of my Alkin compressor, the PCPs, my two tank sets, etc. it actually is more expensive than firearms which cost me nothing in repair time and expense. PCPs have the advantage of less time to clean, but only marginally compared to rimfire rifles.
I've enjoyed having both air rifles and powder burners. My OP in this thread was lamenting the fact that as I get older, I have less patience to chase down leaks and rebuild finicky regulators than I did in years past. I've been on a PCP headache streak recently and the time I've spent repairing them and waiting for repair parts has made me become grouchy. I won't share the particulars as I've got everything working as it should. Let's just say I won't be applying for a job doing warranty repairs for air rifle manufacturers anytime soon.