My book accumulation mania has gotten sooo bad that I've considered getting a scanner and CD burner and scanning everything onto disk. With GIF compression, each page file would be about 100 K, and a 600 Meg CD would hold 6000 pages. At 300 pages per book, that would be 20 books per CD. I could fit my entire book collection, currently filling a storage unit at $70/month, into a single cardboard box!
There just isn't a lot of storage space on a boat. And, after having lived on a small boat on weekends, vacations, holidays, etc., from April until early December (as long as we can push the saling season in Wisconsin), if something comes on the boat, something has to come off. It's a very sparse lifestyle.