At 24K you're gonna need to do valves $300-400 right there
Most likely brake pads will be shot at this point thats another $100 for parts and whatever for labour
My guess is brake fluid probably will need to be done as well, change the coolant. Air filter, plugs etc...
On a good day you're looking to spend 1000$ to get the thing up to speed, or $2k plus in the worst case scenario if we add in tires and other possibilities.
You're now in the 7-8 range. For that kind of money go get yourself a 2010 gsxr or similar. The bike is a couple years old and you won't need to do any of the maintenance any time soon.
Something like this
http://ontario.kijiji.ca/c-cars-veh...s-2010-GSX-R600-White-blue-W0QQAdIdZ417250859
I've bought many bikes over the years and when you try to save money on older bikes it usually ends up biting you in the *** and you spend more in the end.