Are they worth more or just more interesting?

Since I've started collecting, I found that pedigree coins are interesting. I started with the Binion Collection in morgan and peace dollars, and now also have two Walking Liberty's in this pedigree. Then I found The Richmond Collection, The Continental Bank Hoard and The Fitzgerald Collection in dollars, and The Pittman Collection in Walking Liberty. I don't know how many collections there are, but it makes it more fun. The one problem is not all dates are avaliable, plus cost!