Unfortunately Karl, we cant live on love and HAVE to consider the money side of it when making purchases. How cheap can we get it, how much can we make if we re-sell, etc. Your parents have had to become wise to that when they became parents!
And who talks about selling???
Interestingly I hear the same argument from young people when they buy their first kit "Cmon Dad, buy me this kit, I swear Ill play it forever."
I dont want to sound like the voice of doom and gloom here, but youre about to eneter an age bracket in your life where everything is going to change for you. Your parents are probably wise to that and are trying to hold off.
The only real solution I see for you is to save for what you want on your own accord and remove the parents from the picture altogether.