More than likely as with all PBA decisions, this one was strictly a business decision. They're in the business to make money. There are production costs associated with putting on Strikepass. You have a couple of camera people, an engineer or two involved, and an interviewer or two. You tie those people up for a day or two, it costs $$$. Wanna bet that the cost of putting out this live product was greater than the $$ they were getting from Strikepass subscribers?
On the other hand, the cost of putting up a telecast replay onto a server is basically zero, so they make money with only a few survivors.
It may be hard for you to believe, but at this point in time there isn't a huge audience out there for televised bowling. The market is even smaller when you look for bowlers who care about pre-Finals match play AND are computer literate enough to suscribe, set-up, and watch strikepass.