Just did some math. 600,000,000 worth of coins is around 6922 FP clicks the first time. For the next 600,000,000 that is 5616 FP clicks.
It doesn't seem worth it to click that many times to get FP. Seems much better to donate 1.9 or snipe neighbors for 12000 FP. But I can see why you don't mind clicking for M/P. After 6000, what's 80 more?