I thought the "thrill" had gone for me, but I remembered why I got hooked in the first place - the stories, the art and remembered the excitement of getting the next issue of a series to complete a story. I did decide to give up collecting new books as the stories for me were not there and I am widening my bronze and copper collection, where I find the stories and characters stronger.
For me, they are not an investment, though I would be foolish not to see the investment potential, but its the joy to read the stroies and get lost (however so briefly) into another world.