One of the very first warnings I recall seeing when I first got my son a "top end" bat was: Beware, this will quickly become the "team bat."
Has anyone see this before? Little Johnny gets a brand new bat, rakes with it, and then everyone on the team wants to use it. Or, he gets the most expensive bat in the catalog, which everyone knows, and then when he shows up, everyone wants to try it out?
On of my son's teammates actually had an Easton XL1 go dead on him, after maybe 8 months of ownership, because he was letting some (but not all) of his buddies on the team use it during BP and games. (Lesson I since learned: Have a bat for BP and another for your gamer. And, if you hit off machines with those rubber balls, only use a bat that you don't care about...)
Everyone on my son's travel team wanted a XL1 or S1 (and eventually got it). But, when the lust for Easton was there, I went out and got my son a CF5 on purpose because I knew it was a good bat and I knew that his teammates would leave him (and it) alone since it was not the holy Easton.
What's the best way to handle the team bat situation? Tell your kid that no one else on the team can use his bat? That's going to make him an outcast. Tell him that he can only let some of his friends use it? That's not a good "team" situation.
This is something that really needs to be handled at the parent and kid level - as I doubt any coach is going to get involved or set a policy. What's been your experience with it?