IMO a better advantage is that you can hire talent from anywhere, without the caveat that they have to uproot their life to join your team. Paying local market rate is shitty (generally) and reduces your competitiveness against other remote employers that don't try to squeeze 10-40% off employee salaries (which is most of them, FWIW). Not to mention, how could you possibly make 10m rev/employee but with a straight face worry about them making 20k 'too much' because they live in Iowa or something!?
I wouldn't even bother applying at Gitlab because I know they won't pay me competitively. Pass!
TLDR: "can pay local market rates" only works if you're the only company to ever offer remote work, and you have to compete only with other local market offers. Which is a fantasy in 2018.