The like button and the add to watchlist button could be the same or 2 separate buttons. This would help people keep track of domains they are interested in and potentially a 3rd feature would be notification when interested / liked domain is on sale, an email is sent. This display of interests could serve as a mechanism to show public interest and scarcity and allow for better price discovery for both parties.
Accordingly, there would be a tab “Interested” created in the pulldown menu for all the above mentioned domains.