I'd personally (not speaking on behalf of the company) love to acquire Sublime, but it's probably too expensive at this point. I'm pretty sad to see Atom eclipse Sublime so much recently, Sublime is so much faster and change is hard :( If only it were open source.
Seriously, SublimeText, which is $70 closed-source.
Less seriously, macOS and iLife. I'd be ok to pay €200/year/user for an OS of that quality, as long as it's open-source.