yachts

as i've said - i have this thing about yachts and water and moorings and boats and ships and harbors. needed some fresh air this afternoon - wasn't sure i'll find a blip there - and in the end i ended up with a lot of shots that i could use - why is this blip thing like all or none?? you can either use almost all your shots ( and don't really know witch to choose) or you cant really use any of them ? ? ? is that Murphy's blip law ????