I'm not sure what tables they play on changes how much money they would spend though. If a US tour gets off the ground, it needs sponsors, and sponsors need to be getting their return. All that is a question of (a) how many customers do we have now? (b) how many potential customers are up for grabs?
Optomistically, there's a ton of people in category (b) in the US, simply because of disposable income in the middle and upper middle classes. Even with inflation, I can buy more shit than my European counterparts who have my exact same job desciption and experience (primarily because they're being taxed to oblivion). Meanwhile it takes my Malaysian counterparts 45 minutes of work to "earn" enough money to pay for a cup of Starbucks.
So while the European/Asian base right now may be better than the US base skill wise, there are more APA-5's strolling around the US that can dump $1,000 on pool equipment and not really think about it - and that's what matters for sponsorship. A packed house watching a pro-tournament in Vietnam might not be able to outspend a handful of league players in the US who get a bit more invested in the game than where they are at currently.
1) So who in the US has one playing cue that uses a house cue as a breaker .... and is THIS close to buying a dedicated break cue?
2) Who is very, very close to buying a jump cue that doesn't have one?
3) Who is watching old matches on YouTube that is not that far off of being willing to buy a live stream?
All of these are questions for sponsors to consider.