There are several factors that play into the equation IMHO. One is that there are many GREAT bowlers who choose not to venture into the waters due to time, travel, family, etc.
But there is a huge difference from shooting consistent 700's locally (THS's) and what the professionals encounter during their travel. The different houses play differently, even with the same oil pattern. Between different surfaces (various synthetics and wood), the condition of the actual surface, and the various oil patterns, make some incredibly demanding and tough conditions, each unique. Thus, mandating a very adaptable physical game.
It is amazing just how good the Pro's really are, and until you can bowl beside them for 10-12 weeks in a row, most would never see it. Their ability to change the most subtle thing to score, and be consistent with each change. The speed at which they read lanes, ball reactions, and adjust accordingly.
This is not to say many "locals" can not compete with them, or win occasionally, as many have seen it happen in "local" tourneys. But the long haul is quite different. I can cite many instances here, with our local Obenauer Masters Championship, Classic Shootout, etc., featuring many top locals, top national amateurs, and pro's like Angelo, Baker, Ciccone, etc.
I am positive we will hear many other reasons, and maybe even from some that have attempted the tour and decided it wasn't what they expected, for one reason or another.
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The Older We Get, The Better We Were
www.MTFD.com - a NY State Vol. Fire Department
www.BowlWNY.com - local & national stories by Joe Ciccone
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24 is not my age, IQ, or bowling average, but my firematic number, at least I think that what it is