There are lots of reasons that players pick the places they are willing to play. If he wants to stay on the east, and that's the most important thing to him (geography has been reported as important to him), maybe Ottawa is an okay destination for him he was willing to waive for.
But also very possible that Ottawa isn't on the no trade list (this list was created last year and this would have been after they signed Korpi) and was perhaps the only viable trade partner who wasn't on the list, which would also explain a highly deflated value. Given that it could also just be a rental, that's another reason there may not be much going on here.
Hard to say what was going on behind the scenes, but trade value isn't determined by how good a player is on his own and we clearly see that his value appears to have been diminished by something.