We met through our pre-seed investor--our first check. It was a combination of track record of founders and tech that seemed too good to be true, but he could see it working.
Same reason a later seed investor put money in. "If it works, why wouldn't any company buy it?" As we learned (and are still learning) great tech and an obvious market need are only tiny pieces of the puzzle to figure out.
None of us had any experience in the industry, and the company was 3 people at the time our head of sales came on board--not much of a culture to speak of.