Hi all - assuming I can buy a valid PR4 domain - how do I maintain the PR? Any tips? Do I just put good contents and ensure backlins are alive? Or is there no way to keep the PR up? Thanks!
PR will make domain name more expensive and can be useless for your new keywords as well. So I suppose you need to think twice about that.
You should keep building content related to the domain and its keywords. It will be difficult to keep the pagerank, but to the flip side of the coin, if you are good at it you may even increase the PR.