RE: Value
Blade CP's don't go much over $150 mine was 150 AFTER ~$20 shipping, Blade CP Pro's don't end up selling for more than $$!75-200 even with a host of goodies. You'd really have to have some major spares and full alum upgrades before those sell in the 300-400 range. 500 plus is fully decked out all aluminum with belt drive, that's just because they can. It's ready to fly with full upgrades.
Blade CX's usually go for around $100, busted up it's going to be hard to get $75 or 80 out of it. You missed the sell off boat when the CX2's came out. A year ago I'd have said a new CX would get you $150, now a pretty new one would be hard pressed to get $100.
You could always try a higher price first, if you do not sell com back down closer to where your best offers were. Kinda cheating but will get more bang for your auctioning dollar. Not at all advocating this as it's unfair to those bidding. But I'd probably do it if I sold mine.
Real flight not so sure about. I've seen it go for around 100-200.
In no way take this to mean you can't ask for more, it's only what I've seen in looking for spare helis/parts.
I'd say in these ranges you are pretty likely to sell first time around, without re-list/fees/etc...