Is Dropbox overspending on employee perks? I highly doubt it.
Does that make every expense that can be rationalized in comparison to headcount, revenue, or (worst of all) potential pull-through revenue valid? No! Some are valid, some aren't.
All I am saying is, this notion of "we need the very best talent, and we need to make it is as happy as can be" is a platitude that was used by execs to justify a lot of excess.
Seriously, $5 or $10K increase in monthly rent is a pittance. There are a lot more wasteful things I could bitch about than that, and I'm a cheap-ass.