That's obviously the intention, but I was thinking that those arrows would still radiate powerful enhancement magic. They're obviously magical to the guy who gets stuck with them.
Sort of like a Holy Avenger. That sucker's 120,000 gp! But in the hands of anyone but a paladin, its a piddly 8,000 gp +2 sword. Anyone casting Detect Magic on the Holy Avenger would read it as immensely powerful, but then when the wizard's Fighter buddy picks it up he gets pissed because its just a +2 sword.
Similarly, those +5 arrows (50,000 gp) are very powerful magic weapons, but as soon as anyone other than the Arcane Archer who first created it tries to actually fire one they find out those +5 arrows aren't doing as much damage as they'd hoped....