My first thought reading Yul's post was to wonder if term papers are coming up.
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Cross posted from comp.cad.solidworks Some interesting thoughts on the subject:
The main qualifications are typically some sort of technical sales experience.
The good news about a CAD sales job is that without any clue about what you're doing or the product you're selling, you can make more money than a degreed and highly skilled engineer.
PTC has a reputation for being a meat grinder, and the sales side has historically been extremely high pressure. They may have moderated somewhat of late, I don't know.