Actually I did a google search for a Limo myself in Brooklyn and I got $600 for 3 hours + tip for a 7-10 passenger vehicle. (the $500 was quoted by someone else here)
So for $690 , if every person gives $5 (most probably give less) it would take 138 people to give just to break even,
$92 an hour sounds too cheap for a streech limo in Brooklyn