How many people have died in building collapses over the last 50 years? Alternatively, how many people have died in car crashes? Large boats getting sunk? Lightning strikes?
Obviously these are rhetorical questions: it is far, far more likely to be hit by lightning than to die in a building collapse.
If you truly believe this risk is worth mitigating I would put my money/time where my mouth is and not depend on some building supervisor to keep enough parachutes around and keep them in good condition. Instead you should get some training*, buy a BASE jumping parachute and take it with you when you go above 60m. As you say, they are relatively inexpensive.
[1] Note: be careful -- you are much more likely to be killed in your training than you are to need to use it.
That's about the first sensible thing I've seen you say in this thread.
Yes: it's far more cost effective to avoid the risk altogether than attempt to mitigate the exceptionally unlikely event of a very-tall-building collapse or fire, particularly through use of, say, parachutes (into an urban landscape with many landing hazards and few readily accessible landing zones).
On the other hand, that decision also means foregoing opportunities, including the income potential of working for a firm in or near a dense downtown with such tall office towers in it. A cost you might be willing to accept.
Risks and costs can be balanced, though the cases in which people make decisions which are both fully informed and rational strike me as relatively rare.
The supply of highly suspended office space is quite limited and I'd guess that almost none of the highest paid workers work in one. If the cost of a few dozen parachutes is deemed too expensive to hold in reserve for emergencies then I have to seriously doubt that such a space could have much real-increase on income. At best, I'd expect the ownership to collect much of the increase in rent as the small supply is fought for.
Obviously these are rhetorical questions: it is far, far more likely to be hit by lightning than to die in a building collapse.
If you truly believe this risk is worth mitigating I would put my money/time where my mouth is and not depend on some building supervisor to keep enough parachutes around and keep them in good condition. Instead you should get some training*, buy a BASE jumping parachute and take it with you when you go above 60m. As you say, they are relatively inexpensive.
[1] Note: be careful -- you are much more likely to be killed in your training than you are to need to use it.