I have waterers and I noticed that no matter how many nipples I have out for the birds they will rush maddly to open water if it becomes available. It makes me feel bad, like I'm not offering enough water. I like the nipple system because the water is always clean, but am I depriving my birds of water? Alternatively I can use cup waterers . The kind that hook on to a pipe and provide water when the birds hit a little "leaver"'. Trouble is they are five to six times as expensive as nipples. Any body have any Ideas??