Would it be possible to sell an account, instead just giving it ?
Ofc, by selling I ment few euro/usd donation to Red Cross, UNICEF, some other humanitarian org? Mister X gives the login/pass after some proof of such donation will be presented by the buyer?

Would that be legal?

No, it would not be legal.

Maybe it would be time to make such thing legal? Or at least start a debate?
Imho everybody profits:
1. Kids/adults, any good cause will have maybe just a tiny little, but always help,
2. Instead of another deleted/ v-moded account, GF will have paying customer,
3. Uni will hold to active player, instead of loosing one,
4. "Seller", who put a lot of effort to keep and develop account, along with "buyer" will do something good,
5. Think of PR power for GF.
6. It'll be a good way to control account trading, cause it's rly easy just to sell it via ebay for example.

Dear players, admin, mods.. please - can we at least debate about it?

Sure you can talk about this.

Your intention looks good, but who decides which organisation is OK to spend ? At least the users "spend" the money to a fantasy organisation from the account owner.
Everyone can do your suggestion now, but in a little other way:

You can tell "When you want this account,please spend a few Euro to your national red cross org." Sure, not everyone follow this wish, but many people does.

I belive the matter who gets the donation will be between buyer and seller. Sure, GF would be involved = informed for approval, but still it's between players.
On the other hand, It may be good to appoint in such situation a global org to avoid "this country or that country" and in that case Red Cross or UNICEF are ok along with lot of others.

To be honest - I've talked with some friends who left this uni in last 3 weeks, good accounts > 150+, and to my suprise, they preffered to put them into V-mode and to be deleted, than to give them away, but every single one of them would instantly agree to trade it for such a donation.

It would be nice to have such an alternative as a legal one

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Out of curiosity:
allegro.pl/listing.php/search?sg=0&p=2&string=ogame

most of the offers are moonshots/resurces, but still - 11 accounts for sale