Steem info needed

Hi Steemians!

I have seen a crazy account with an estimated value of $800 000 or around there. I can only assume that he bought a lot of Steem during his time here. So there are two things which I would find very interesting:

1. Which account has the greatest estimated value?
2. Which account has the greatest estimated value that did not buy Steem at all?

If you can answer my questions, or direct me to a link that can, I would be very grateful!