lmao. Heck if I had that few stratgics, i'd happily trade all of them for a high class civilization capital. That said on a programming end player trades bunch of planets away for resources, goes to war and takes them all back is kind of like trope behaviour? I'd personally specifically code some kind of "while I appreciate the outstanding deal your offering, my advisors were pretty convincing you'd only make this kind of deal if you were planning on declaring war and taking it back so no thank you" response.

Update: After offering the Iconians their revered homeworld for - a - single - Elerium, the Iconians laconically accepted the benevolent offer, answering just... "Fine." Didn't even get a single plus for the diplomacy screen. Oh the ungrateful bastardos!

In any case, after they got settled back to their original planet, Yor promptly invaded and now the Iconians are without their homeworld. Again.

You think that selling Iconia for one elurum is a good deal. 

not to the seller.