I'll be glad once season five is out, then my spending on TNG discs will be over.
Were it not for a great deal, I'd be in the same boat. I bought them in 2002 for $110 per season. Years later, some guy offered me $500 for the whole show ($200 more than my asking price), since I had all the Best Buy bonus discs, which he desperately wanted for some reason.
Now today, I'm buying back the show for less than what I sold the DVDs for.