Even if only 500 are kept per wedding that quickly piles up...
Say two weddings per week and 40 weekends: 80*500=40000 in a year.
What if the photog knows that the couple split? Do you still keep them?
Sorry I couldn't resist.
It's just that weddings so quickly become a thing of the past (especially so considering how short some marriages last these days), that I wonder how much value there is in keeping the original digital images beyond a few years? When the photographers retires or "moves on", what becomes of the images? Aren't much use in the afterlife.
OTOH, a good landscape image has a bit more lasting value it would seem.