It's also way the heck easier to get emails, provided that you give them some motivation to sign on. It's inherently a private, low-risk transaction (provided that your signaling is consistent).
As to domain expertise, "well-known value-producing field" x "very specific customers whose needs you deeply understand" is both sufficient and awesomely effective.
As to domain expertise, "well-known value-producing field" x "very specific customers whose needs you deeply understand" is both sufficient and awesomely effective.