What should I do with my son?

I would suggest you do what is the best for him all round and not put a sheep station on a small child attending an event that as you say you cannot afford. It is good that he is doing well but from your other posts a majority of his doing well is the fact that you know what you are doing as far as the bike is concerned and he would be competing against a lot of kids who don't have that backing. I have seen a ton of kids who had parents who were themselves interested in the sport and their kids had every opportunity in the world as their parents had the contacts and in the end the kids got to teenagers and decided to go hang out with friends and party instead. Most of the people who sponsor the senior riders say the same thing, that you cannot tell if a kid is going to make it until it becomes up to them and that is why they are not as interested in sponsoring juniors. The playing field in juniors is not even as you have so many different sizes of kids and maturity, you also have kids on worked bikes against kids whose dads have no idea. when they get to senior pro level the playing field becomes even and then ability shines through. It won't matter in 10 years whether he went to this event or not so if you cannot afford it don't go.

Let him win where he can compete and may he accept that there are some events he can't compete at because of financial reasons. I am sure Zach will understand that your wallet isn't chock a block full of $100 bills and he will not have a problem having to miss the odd event; we all have had that set back. It isn't a problem; it's a set back and not worth worrying over.

Zach is fortunate that he has his Dad's support and his Dad's knowledge about bikes and racing and that will be what is important to him.