Definitely too much hassle for the 7k / 3.5k payout.
Me and my crew leader were discussing this mission last night funnily enough. We are under the impression that R* dropped the ball on this one majorly!
Rooftop rumble... What the fk is this mission all about and wtf has being at the bottom of a car park got to do with a "rooftop rumble"? We think rockstar got the missions mixed up between rooftop rumble and high priority case. If you think about it roof top rumble is one of the simplest missions out there - takes 2 mins max and pays out 25K / 12.5K.
High priority case on the other hand can take a good 10 - 15 mins to complete depending on if you can get a chopper straight away, its based on a roof top (hint) and there are a shed load of people to kill (rumble).
I also think that they got the levels mixed up and you should have access to roof top rumble when high priority case gets released and visa versa.
Think this makes sense?