@Doubtful,
On Broadway plays charge more, theaters pay higher rent and the tickets are harder to get, cost premium prices. Often times there are well-known stars in these plays. Theaters here are 500-seat-capacity or greater.
"An Off-Broadway theatre is a professional venue in New York City with a seating capacity between 100 and 499. These theatres are smaller than Broadway theatres.
An "Off-Broadway production" is a production of a play, musical or revue that appears in such a venue, and which adheres to related trade union and other contracts.."
When a play is located 'Off-Broadway', it's near to Broadway in Manhattan. Such plays may be considered a bit less prestigious but a cheaper ticket price...maybe even a little experimental in nature. Future stars may appear in these plays.
"Off-Off-Broadway theatrical productions in New York City are those in theatres that are smaller than Broadway and Off-Broadway theatres. Off-Off-Broadway theatres are often defined as theatres that have fewer than 100 seats, though the term can be used for any show in the New York City area that employs union actors, but not under an Off-Broadway, Broadway, or LORT contract. The shows range from professional productions by established artists to small amateur performances."
'Off-off-Broadway', which can be far riskier but quite reasonable in price. These can quiet experimental. Future stars might appear here or even drama students or novices.