I like my customs a lot, and if I just leave them in the drawer/safe, I won't be spending enough time with them. And I use a knife A LOT during the day. Since I carry more than one knife, I can usually find time/space for one high-end custom. Among my carry knives are pieces by Ed Schempp and Bailey Bradshaw. Now although you would not use these knives for prying, they can certainly handle anything that knives are designed to do. Yes, they are very pelasing to the eye, but they are knives--they are made to work for a living, and they do their jobs quite well. Do they require more maintainence? Maybe a little. Worth it-- ubetcherass! I don't know why this is difficult to explain to people--most folks would rather have a Ferrari than an old beat up Chevy Nova-- and if they had a Ferrari, would they leave it in the garage becasue it might get dented or dirty? This is not to say that you use the Ferrari to go four-wheeling up Imogene Pass-- there are other cars made for that, and there are other knives made for using as a camp knife, cutting tomatoes against a flat rock, etc.
Personally, I don't buy knives for investment value--I buy 'em because I like them. I enjoy using them as well as loking at them, and, at the end of the day, I can look the maker in the eye and say that I sure as hell get full value, and more, for my money.