You're forgeting one key intelegent item rules:
No intelligent item wants to share its wielder with others. An intelligent item is aware of the presence of any other intelligent item within 60 feet, and most intelligent items try their best to mislead or distract their host so that she ignores or destroys the rival.
So no, intelegent items are the last thing you'll ever see doing an harmonious hive mind. They're not devout slaves that lick their master's boots and play nice with each other all the time. They're proud beings, they like being on top, and and they will not share it with anyone or anything else.
Yes, now this is clearly correct. Okay, so you only get one intelligent item no matter what (well, you can get a few, but only if you don't mind your gear always trying to destroy other parts of said gear, which would be hilarious to play but probably not so good for long term health).
Spacemonkey: do you acknowledge that your earlier position was incorrect (namely, what permanent magic items means)? Because if you're going to run around yelling about how no one else understands the rules and you do, holding onto that looks pretty foolish. You'll note that when someone actually quotes a rule (as above) that indicates something doesn't work, I'm fully ready to acknowledge it. Again:
"Only permanent magic items (as opposed to single-use items or those with charges) can be intelligent. (This means that potions, scrolls, and wands, among other items, are never intelligent.)"
That's clearly stating that the magic has to be one use or charged to be illegal... ammunition can be reusable (raptor arrows) and even regular ammo has a 50% chance of not being single use if it misses, and ammo does not have charges.
Which leaves us with only the question of whether the intelligent items get the ammo discount. This is somewhat up in the air... we know that listed prices are actually the cost for 50 when talking about ammunition in general. There is nothing that says "this only applies to weapon enchantments" but then again it doesn't say the opposite either, simply because I don't think anyone ever thought of it. The only line we have is
"This price is for 50 arrows, crossbow bolts, or sling bullets."
But we also know that ammunition with special abilities that aren't enhancement bonus based (things that might otherwise cost +500 or something) do in fact get the 1/50th discount (since they're all so cheap), indicating that this is indeed the general rule. So, it does seem likely that the 1/50th discount is supposed to work for all ammunition and for all properties that might go on ammunition (except the Raptor Arrow, which is FAR more expensive, but that's not surprising).
So what evidence do you have that ammunition is not supposed to get the 1/50th discount for all magic enchantment on it, including Intelligent Items?
JaronK