I fill the time between clouds and rain with browsing the forums, reading up on new equipment, footering with my own gear, etc. I dont feel it to be too big a burden only getting a few nights nights a month. But I also have a very busy life outside of astronomy, I have young children, I run a business and have other professional commitments to complete. There is the right balance of skies for me at the minute. I do get frustrated, but this makes the enjoyment better when it is clear. I also like knowing that I have the equipment there, and feel that I have accomplished something that not many people have. I dont think I've ever really thought about not buying stuff based on the lack of use.