We love Disney as well and live in Vegas so it's a close drive. Also, how do they know if the kid is 3 or not? I don't want to be dishonest but $80 seems like a lot to pay for a 3 year old.
I can't remember if they as for the birth certificate or not, thought I would support them if they did.
If you don't want to be dishonest, don't. If your kid is 3, pay. Yes it's a lot, but if you can't afford it or don't want to pay it, don't go.
Is $80 the one day price for a 3-9 ticket or a 10+ ticket? They are different. You also get a better deal if you buy a multi-day pass.