Nice .com "niche" name assortment you have.
I like ProSnooker.com the best..
Many a good potential lead @ google using keywords:
pro snooker
Here's one:
SNOOKER REFEREEING - SNOOKER REFEREEING. The Professional. Way. The Official Website of Eirian Williams - one of World Snookers' Senior Referees, Hello and welcome to my website. ... http://www.prosnookerref.co.uk/
A little email marketing directly too the leads on google will most likely land an interested buyer.