Running before research comes to mind. You need 250 hours before you can take an Instructor Course in JAA Land and a CPL to get paid for the work. I dare say the requirements will be similar across the pond in FAA land, so whomever wrote you could spend £7K for it may be a little low on the figures! You can instruct with just a PPL, but you can't get paid for it, which rather defeats the purpose of getting paid for hour building.