oh, so you're new to back issues, eh? yeah, when books are a couple years old (hell, even a couple of months old) and they're really good and highly sought after, their prices go up.
Books from about 1980-1996 are cheap, because so many were being produced. Comics were selling well, stores were making money, and collectors were buying multiple copies because they thought the books would be worth alot some day. Then the market collapsed and sales plummeted. Many stores went out of business, and many collectors unloaded their books.
So today there's something in the region of 250,000 regular comic collectors. But books from 1980-1996 were produced in extremely high numbers, 250,000 copies each, easily. Some books have millions. But how many of the current 250K people are interested in any one of those books now? maybe 50k? so there's enough for everyone who wants one to have 5 copies of a book. Therefore, the supply far excedes the demand, and those books are worth next to nothing.
Following that, in order to make money, everyone had to play things close to the belt, and only about as many copies of the book were to be sold could be produced. A book like Daredevil 1998 sold maybe 50,000 copies, let's say, but then word of mouth spread about how good it was and maybe 60 or 70,000 people wanted to own them. Now there's more demand then supply, so prices go up.
The big books ARE the way to go. Keep in mind that though they're priced at $25 canadian, you're getting many 12 or so issue that average out to around $2 apeice, so it's far cheaper. Buying the originals is something for collectors, buying the collected editions is for readers. Some of us do both, but right now I think you're probably most interested in READING, right? so yeah, get the collected editions.