Pool isn't on TV anymore was mainly on ESPN & ESPN2 I was never into pool or snooker thought it was boring.
Well revenue and ratings are a factor here. It's like cable news/talk channels its better to have Hannity, Maddow on their respective cable news/talk channels because its cheaper to produce than news documentaries and investigative journalism though.
Sports/talk channels are in a similar situation where its cheaper to have a pundit for sports topics like Jemele Hill, Stephen A.Smith doing rants and gossip about the NFL and NBA because somehow there's evidence that these pundits make the most revenue and ratings for ESPN than Billiards where that sport has a lower TV audience size in the USA.
Note the as of today billiards in the USA is only televised and various YouTube channels and they have a small following though.