I think this says it best. If this hobby stops being one of fun in some form, then it's time to either step away or end a project.
Two stories about my searches...
When Captain-C first came out, I managed to snag half of the Sakic "C" through C&C when they pulled it as a part of a break. Worked out a deal and got it. So then I'm waiting for just one silly card. Forum searches, Ebay saved searches, Worthpoint, Facebook, Twitter, Photobucket...Earlier this year low and behold it popped up on Ebay. Made a very generous offer and it was mine. About five years in the making!
Since 2012-13 I have been working on the ITG History of Hockey Great Moments in Hockey History set. It's a 144 card set featuring great memorabilia from the greats of the game. More than half of the set is limited to /10 print runs, many with highly coveted vintge memorabilia. I am down to just one card (Habs Win 5th Straight Cup if anyone has it!), and I will not let it rest. I haven't even seen an image of the card. I have plans to display the set and I won't do so until it's complete. The thought of how great it's going to look up on the wall keeps me searching every little nook and cranny of the internet for it. I thought I had it tracked down as Priban on SCF had it, but he informed me months after I sent him a PM that he sold it at a show. I have opened cases of it looking for it. One day it will be mine!
I'm still having fun with the chase, however frustrating it might be. But when the day comes where I find it, the rush will be unreal!