Smart Parts did a price drop on every marker they make on April 1. It wasn't just the Ion that dropped they all did.
The Ion has changed the paintball world already. If it were to drop in price even more it would move more of them out to the public. I'm more than slightly biased towards the Ion since I've owned one for over a year now and have had 0 problems out of it. I usually tear down 5-6 a day on a busy weekend at the field and replace the rear hose when it starts leaking. It's not a matter of if it will, it's a matter of when it will. I don't find the Ion any more difficult to tear down than any of the clamshell Timmy's running around out there.
As far as a player needing to learn skills before they move up in the marker capabilities that's another of the long list of traditions that have been thrown out the window. These days it's very common to see first time players with mid-high level markers simply because they have read about them and have access to Mom's gold card. I see it every weekend.
Smart Pars is very rigid when it comes to MAP pricing and enforcing the policy. That's why when the Ion went on sale at walmart.com for less than MAP SP suddenly called up the middle man in the transaction and put a quick halt to it. It was probably on the website for less than a week with a price less than MAP. Even though it wasn't Walmart who was actually selling the marker it does show the influence SP has over it's dealers when it comes to MAP.
Finally what's wrong with a "plastic" marker? It's not like the whole thing is made out of plastic. It's just a shell over the working parts which makes it very easy and inexpensive to replace should some major damage happen to it. What happens when you slide into a bunker with an aluminium marker and it happens to slide on the ground and finds a rock? A nasty scratch that is pretty muh there forever unless you want to replace the whole thing. Glock, Sig, and Taurus haven't found any reason to not build real firearms out of polymers. They can't be that bad.