Then his buddies roll up their sleeves and make sure they get them to Philmont or Jambouree. Help other people at all times.... that includes your best friends/buddies in the patrol. Once one gets to that level in the patrols/troop, then some of the MY Eagle, MY scouting experience, MY money in MY scout account.... MY.... starts going away. It's that kind of thinking that makes the best Paper Eagles. Until a scout begins to quit worrying about himself and starts thinking about others, he's never going to figure out what Scouting is really all about. For sure, they'll never figure out what servant leadership is all about.
Once one has a kid come around on that point, the next step is to work on his parents, too.
Yep, my friends helped me sell some of Mamma's hard-tack candy so I could do Jambo (and some other things).
Just to flip @Stosh's argument around, you might have a boy who sees his expenses as an extra burden on the patrol, and works his job and personal life to pay for his junkets. One of our Eagles had an established lawn care business that payed for HA's, tech school, and employed a few other boys.
Sometimes, I lent my (scout/non-scout) buddies a hand doing their jobs. I wasn't thinking of the "end game". They had a job to do, I had time. Still see it happening, although employment regulations make it a little less likely.
If you want an iron-clad financial system that fairly accounts for these random acts of kindness, look elsewhere. A boy's sense of fairness hinges more on who you will or will not allow to have a scoutmaster conference.