Backstory: I've used this company once before and will be again in a couple weeks for a group of friends to go to a concert in another city over an hour away. Both of these times for 7 hours of rental from 7:30pm to 2:30am for up to 18 people it has been sub $700 + gratuity.
Granted this is a smaller bus, however I was quoted for the next size up that holds up to 22 people, and it was $792 + gratuity. So only a $100 difference.
By that math I would expect this size to be around $992 + gratuity, maybe a little more since it's a summer date.....but after tip (which is a mandatory 20% btw) it comes out to $2k+ for 4 HOURS.

After our next concert, I plan to email this and politely ask why it's almost triple the cost for half the time.