I agree that prizes are not the primary reason most of us play competitive paintball, but when presented with a choice of series, it is a valid factor to consider. It is, of course, not the only factor to consider, as next year's Skyball may illustrate. Posters on this forum have discussed other important factors, and the split of the NPPL and the PSP is due mainly to the importance of these other factors, including unbiased and skillful marshalling standards, safety rules and the enforcement thereof, good venues, pleasant and affordable host cities, player amenities (free fruit/water, discreet staging tents, sufficient numbers of clean porta-johns, etc.), industry presence and technical support, the degree to which an event or series attracts media and mainstream attention, and of course prizes.
All of us have different priorities, whether or not they are well thought out. Passion for the game is sort of a given for players.