Martin McDonagh’s creepy play “The Pillowman” isn’t just dark, it’s black.In the black, that is: Producers announced that the show recouped its $2.2 million investment during the week of Aug. 15-21, after 22 weeks on Broadway. Just in time, too. Production, starring Billy Crudup and Jeff Goldblum, will close Sunday. New plays on Broadway that close at a profit are rare these days, but this season “Pillowman” joins a club that already has “Doubt” as a member. That Tony winner earned back its $2 million investment in June after just 15 weeks. Before that, you’d have to look back to 2003 to find a new play that made back its investment on the Rialto. That was Yasmina Reza’s “Life x 3.” (New one-man shows have fared better. Last season, Billy Crystal raked in dough with “700 Sundays,” and the hit recouped just seven weeks after its first preview.) Next up at the Booth: Lincoln Center Theater’s production of Edward Albee’s “Seascape,” which opens Nov. 21.