I imagine there will be a core that will go on (PL) regardless, but for a fair few the (forlorn hope of) esteem might be a driver, and then the the prospect of dosh is real pull. Me? Well I came to PL to test my ideas, not to win a competition. I usually start each month relatively weak because my selections tend to be of one of two trials, but switch over to something more serious if I am anywhere close at the end of calendar months. (I never suggested it made sense).
I have never been a regular contributor especially on weekends because Sautrdays are manic (with several a la casa and recreational activities). But my enthusiasm is not high as I am finding the book prices "tight" at the moment, and it is a case of it does not feel worthwhile going on (in real punting and paper punting.