> Everything can be bought...if the price is right ...
should cover a lifetime
actually if you live 60 years * 100$ = 6000 $
However at some point (perhaps in 5-15 years) the editor might not be able to connect to the licensing server due to discontinued support - so you will be forced to move onto whatever other editor there is and the yearly subscription fee might be 250$ per anum.
One thing to remember is that the fee can be changed every year - scirra can "tweak" the price as they see fit. More features= bigger price. My guess is that it will grow exponentially
Actually I think the pound just went down some more while you were typing that.
Blame Brexit I guess.
So don't count all your sharks with lasers attached to their heads before they are hatched.