If you play on most holidays you get a free ball. You want more? This is the WGT, but I do applaud your thought. And on your mobile app, each day they give you a spin to get free coins (not that the coins are worth anything). You still want something more?
I'm not sure that it matters to the company how many people register and only play the game for one day before leaving and never returning. It would be nice to have real numbers telling us how many actual users there are on any given day, but this is proprietary information that would never be released.
As a player my only concern is that the company stays profitable so that the game stays available and free here on the internet.