Because money appears out of thin air

The other day Jake woke up in the morning, and this was our first conversation:

Jake: beach! see crabs!

Me: you want to go to the beach and see the crabs on the rocks? (We saw those during our Mexico trip.)

Jake: yes!

Me: aww... I'd like to go to the beach, too. But we'd have to get on a plane and fly there.

Jake: want to get on plane!

Me: we'd have to buy plane tickets. Do you have the money for that?

Jake: nodding yes.