Me: Hi, I'd like to buy one of your $10K machines but I have a few questions that I need answered before I can do that.
Salesperson at trade show: Sure, email that to me.
me (email): *questions*
salesperson: (no reply)
me (several days later from an alternate email address): *questions*
salesperson: (no reply)
me a couple months later: *calls phone number on business card, leaves voicemail*

It shouldn't be this hard to spend several thousands of dollars. I want to buy, take the easy sale.