First of all, there is no such thing as a "must buy" except in the case of essentials that one needs to exist. "Must buy" and "must have" is just marketing jargon. And people who get sucked into buying just because something is described as "must have" or "must own" are suckas.
And it's my fault for not being clearer earlier--I don't buy DVDs just for the extras. But the extras may influence my buying decision if they're worthwhile enough.
I rarely ever buy new because pre-owned DVDs are often more than half the cost of retail. And why buy when I can rent specific discs from season sets through Netflix? There are plenty of cartoon DVDs on the market that I'd like to see again just because it's been so long since I saw them, but that doesn't mean I want to own them.
From my observation and experience, a lot of people who have made DVD buying decisions based on nostalgic impulses have sometimes ended up regretting it for one reason or another.
But not having seen BBS3 yet, I didn't know how many decent episodes were in the set or if perhaps the quality waned in the last season as happened with other shows. I was on the road back then and out of touch--did the series have a decent finale, or was ROTJ the last hurrah?
I get what you mean. If it weren't for Transformers the Movie, I would probably be like you.
What I mean is, when I was a kid, I would rent the Transformers movie every few weeks, and then, when I finally got an allowance, and saved up to buy it, it was out of print, and no store had used copies for sale. So I only had to keep renting it when I wanted to watch it, until I found a bootleg copy at a comic convention that worked 1 freaking time. Fortunately, Rhino released the movie about 6 months later.
As for series, well, being that they rarely put a series on VHS, and if they did, it was always just random episode, and once a show left TV, that was practically it forever. I hated that, as I want to watch whatever when I want. Thus, I will forever buy every series and movie I like even if I only watch it once every 5 years. Just knowing that I can grab it at any time, choose from any episode at any time, brings joy in my eyes. Like The Simpsons for example. I haven't touched Seasons 3-5 since I first bought them, but they are sitting there on my shelf, ready for me to watch any time I feel like watching it, and that makes paying for them worth it.