Pro Tip on Media
"There are films I've bought on DVD (and a couple on Blu-ray) that have only been watched once and I wonder if it's worth it"
Rent first time, unless you can't get it on rental. The cost of an extra £3 for 10% of your films that you want to watch again is much cheaper than £15 on 100% of your films, 90% of which you could have spent £3 on. And by the time you want to see them again, they'll have fallen from £15 to £7 anyway.