"The Prothean is optional content that is certainly designed to appeal to long-time fans, which is why he is part of the CE offering (the version many fans would be likely to purchase). Mass Effect 3 is a complete - and a huge game - right out of the box."
If it designed to appeal to long- time fans, why didn't you put it in the god-damn regular game?
Screw the collector's edition, it's a Prothean, it's important to the plot line, and even new fans want to see a Prothean.