How do you decide which movies are worth buying?

[Krizzle1]

Ive recently got into buying blurays and have bought a bunch but i keep thinking twice before making a purchase, everything ive bought so far, ive already seen (either in cinema's or digital), but some movies I think are worth watching more than once, and thats when I might buy them on bluray.

My criteria:
- Will I watch it more than twice?
- Would it look amazing getting the movie in the highest quality?
- Price (obviously)

I've been going through the Poundland blurays thread and see loads of totally random titles (imo) being bought for a couple of quid, but I think to myself I'll might just watch that movie once and then it'll just collect dust and take up space (when you add all those 'watch-one' titles up)

But also...recently a member also said something along the lines of "If a movie is worth watching, its worth watching in the highest quality"