Mostly money - don’t really care about title or prestige
It's because the skillset is rare; hospitals aren't going to buy some medical equipment from some sweet talker in a suit. They prefer a nerd who understands exactly what they're selling and what the advantages and disadvantages are, maybe even explain training needed. I had one oscilloscope sales job offer, where the boss insists that the hardest part is understanding the tech, and the sales part is easy to train.
Many sales roles give commissions, which can come up to a hell lot.
Software probably doesn't involve the dirty details anymore, but I imagine things like selling a database, AWS-type service, military technology, machine learning, and so on.