Perhaps these profiles were once active, but the owners have long since left the site. In fact, I'm certain that my profile is being used without my permission to lure unsuspecting women into purchasing a membership. I've deactivated it, but they said they will "keep it on file for a year in case I returned", which is how they get to use my profile without my permission in a dishonest attempt to make their site look like it has more members than it actually has.
If match_type is 0 and lookup_value is a text string, you can use the wildcard characters — the question mark (?) and asterisk (*) — in the lookup_value argument. A question mark matches any single character; an asterisk matches any sequence of characters. If you want to find an actual question mark or asterisk, type a tilde (~) before the character.