RE: So what!
There is definitely that trust issue you mention about keys, but, for me, there is not much at stake, so I said "wtf, let's try it and see how it goes". When I thought about it a bit more, I realized that the best course was to grasp that extra value given by HIVE and use it quickly before it vanishes.
The main reason I think HIVE is just hot air, is that it materialized from nothing; it exploits all the work & investment made for STEEM, doubling all the tokens held by STEEM users in one rushed move. Where does all that doubling value come from? I haven't got an crypto-economics degree, just my gut-feeling telling me that there is nothing to back this up.
As a matter of fact, I just saw that the value of HIVE was halved in 7 days, more or less. For me, it was expected.
I will say this: Neither Steem, nor Hive has anything to back the value expect maybe a community. I am not that much into making money from this anymore, at least not until the Danish tax-pigs can tell me what to do with it. So I am mostly here to post art. I guess Justin Sun will put some money into keeping the value of Steem up, so that is a good thing if you want to sell. But who knows what the future will bring. Maybe Akasha will be better?