Is sales a legit money machine?

I’ve been working as a design engineer for the past 5 years and I barely got to a 100k salary. I saw lots of posts here from people making from 300k-Millions. Is it legit or this community is just the appearance and people lying? What’s the industry to go for? How much you’re making and how long it took to get there? Cause if that’s all true I wanna leave engineering and switch to sales asap.