I've probably spent (assuming 3 compressors, since the one that caught fire I returned) about $500 or $600, as they are about $160 to $200 per unit.
Aside from major tools like my Pistorius saw, Pistorius v-nailer and VacuSeal 4468h press which are all top-of-the-line and were bought new, items like compressors I've felt are actually less expensive to purchase and throw out every 2 or 3 years, rather than buy one 5x to 10x the price, but have the cost of maintaining them to offset that high expense.
Fire is the main concern, which I hope is rare. I've set a protocol after that fire (which luckily my employee caught in time) where we keep the store keys by the master-off switch for the compressor, so we don't accidentally leave it on overnight, to prevent it running when we're not here (to prevent a fire when we can't stop it).
The new one we just bought, its darn quiet, it cost me about $160, and I anticipate having to throw it out in 2020. For $6 per month, that is an acceptable loss, in my opinion.