I think children conspire for the most expensive instruments. Saxophones cost big bucks as do tubas and a top end euphonium is a killer as well. Be thrilled if they only want a decent trumpet. One of the really outrageous things that I saw recently was a flute designed to attract very spoiled people. You could get it in high carat, solid gold or even platinum. These things were pushing $10,000 dollars and even more in some cases. Yet testing revealed that those costly metals offered zero playing advantages at all compared to common brass, plated flutes.