Estimates on how much bitcoin.com would fetch on the open market?
He leased / rented it a few years ago for something around 10k/month, but the people who leased it were garbage at running a website / business and he took it back.
As for the value I don't think he will sell it and doubt he'll put a value on it.
Please can you share the history of bitcoin.com domain? I am really interested how Roger get his hands on this domain and somehow curious, why theymos and people behind bitcointalk.org / bitcoin.org didn't get that domain.
On another hand OP, it doesn't matter much what was website's history which was built on bitcoin.com domain if Roger plans to sell because this is top domain. Just check yourself keyword "Bitcoin" in google keyword planner and you'll see the results. So domain bitcoin.com worths millions and if we consider the fact that it's news website, these news worths money too and it adds extra price to it but domain alone still rocks.
I'm not sure of specifics, I know many years ago bitcoin.com just redirected to bitcoin.org. Then it was leased to a group from Roger and the next part of what I remember is a tweet / message from Roger bashing on the people he leased it to after they claimed they couldn't run it at a profit. Sometime after that it was returned to his control and then it became the bitcoin.com of today (well started to at least).
To be fair he was "bashing" on them because they claimed they couldn't pay but still wanted to run the site. His bashing was along the lines of how to run a website and what things you could do to bring in some revenue so they could pay him.