Basically, a qualified purchaser is just a super rich person.
No, seriously... they're super rich.
We're talking a sophisticated investor (not a bumbling retail investor) who has at least $5 million in investments, or a family-owned business or trust with at least $5 million in investments, or a corporation that invests for others with at least $25 million.
Since they have so much cash, these folks don't have to meet as many rules because the government thinks they need less protecting (i.e., they know what they're doing).