I see.. I just happen to be in possession of this account, and neither me nor the previous owner were much into the
crypto who-is-who to recognise immediately the fame of this account. So after becoming aware of it I
just wondered what is the value.

Another possible point for abuse is that the previous owner is really known to be crypto-rich, so with bad intentions
I could use it to post "Changed my mind, BTC is bullshit, I'll dump all of mine tomorrow" to get a short
price dip. However, I doubt that this would work out.

So, to be clear: I will not use this account for such a thing and I will not sell it. If I have a boring day, I might
give it another try to contact the original owner (which is not so easy, as he is a little bit famous so his social
networks have the PM-ability disabled etc, I tried this already).
Otherwise Ill just keep it as a kind of collectible.