cool_hardware52:That's an interesting article, thanks for the link.
What I find missing from the analysis is: ...
Agreed, there are costs not included but the example I pointed to was not a commercial enterprise. They used residential property and probably didn't bother with supplementary insurance.
There are lots of ways to calculate costs. An accountant could make virtually anything from answering the phones to wiping off the counters look like an enormous expense, but the real supplementary cost is far less. In practice those costs do not represent much of an addition to standard overhead. I mean that you can allocate a certain number of minutes labor to a fill but few employees are brought in just to fill tanks, they have to be there anyway, compressor or no compressor. Shut down the air for a few days and you'll likely still have the same payroll to meet.
Similarly, while floor space is an accounting cost it's only a true cost if you could have otherwise used it productively. Your building is what your building is and removing the compressor wouldn't save you anything on rent. If I were to allocate the floor space my scuba gear takes up in my house, it would cost me a lot of money to be a diver next year even if I don't go diving.
We must also accept that just because you amortize the compressor over 5 years it doesn't go *poof* and disappear after 5 years.
Anyway, I'm not trying to say anything definitive that an air fill costs $1 or $10 (although I think $20 is a stretch) but that there are lots of ways to look at costs.