lol Man there is no way I'd spend that much money for that convenience. Hell it will be dust in that iMac in less that a month after you get it. Might as well save a lot of money and do it yourself.
Gotta be honest I'd be a little concerned too. You're right that the price is high but has anyone done the upgrade themselves with no dust appearing inside the screen??
After spendin the bucks on the machine and separate SSD, it's just not worth it if the screen is compromised