Shouldn't you purchase the stuff you enjoy?
Even though there is no exclusives, I would still buy the title regardless.
I'm not a fan of the series, but if you enjoyed the show - then why not buy?
- - -
I am a collector and for the most part I buy a particular series/franchise, I will want to complete it. There are exceptions, obviously.
"Return Of The Living Dead"... one through three are entertaining (I'm one of the few who really enjoyed 'Part II'), but it ends there. The rest of the film series is... just awful and shouldn't bare the name.
"Tremors" - I own one through three. I couldn't stand part four will not be adding that to my library. EVER. As for the TV show? Never seen it, don't know.
Anyhow. Just because season seven is a basic release, doesn't mean it won't entertain you.