Well, you didn't factor in the opportunity cost. Using ISO on Champion mean less ISO to level the character you actually use.
I have many maxed 2 and 3 star characters, also a few I haven't maxed. Is it worth it to max them? What is the extra value of the ' prizes'? I am speaking of the 2 stars, for a LT 3 stars seem worth it.
Frankly, I've actually dropped a couple Level 15 13-cover 2*s to make room for my latest additions to 2-3 pages of single cover 4*s, so I guess I've even reacted contrary to what D3 seems to have been hoping.
I've noticed that Championed characters can be sold for some HP in addition to ISO. Could someone with a 144 2* say how much ISO/HP they sell for?
A question to the masters of MPQ out there. I have roster with a few 3* champions that I had at 166 when the change occurred. I also have quite a few 3* characters who are around 120-140. Most fully covered, but not at 166 yet. I'm assuming it's a better use of my ISO at the moment to move all of those guys up to 166 (well, not Sentry or whatever, but the good ones) rather than take just one, say Hood, and spend a boat-load of ISO to move him up 20 levels and then champion, right?
I guess part of me wants to feel that "big progress" feel that championing does, but I also know that it's probably not the best use of my ISO.
The obvious questions are do you use these other 3*'s often or not and do you have any fully covered 4*'s that would benefit more from your iso?
Personally, I was in the process of levelling my roster when champions showed up so most of mine were 130's and what I have been tending to do is champion the previous pve award so when they reach 166 I already have 4 or more covers to boost them up, it works for me until I get a couple of decent 4* fully covered.