How about raising the restriction set at 5 for catagory “My FlightAware: My Aircraft/My Airports” to 10 to 15 which would be a more ideal. 
Thanks
at $20/month, that’s kinda expensive just to get a few more flights to follow
On the flip side looking at the whole picture, you exponentially increase queries which of course requires increased infrastructure.
You get what you pay for.
5 airports / planes more then reasonable for my casual needs if you get my drift. 