I used to 'buy' mp3s from Emusic as I could actually download and keep the files, whereas some competing sites would only let me listen to them online. Which is a similar business method to what this covers, regarding movie 'buying'. My Luddite tendency comes to the fore when I get offered the chance to 'buy' something subject to rights management, licensing restrictions and changes etc...that end up with me owning nothing, even though I 'bought' it at one stage.
Scam, scam, scam...as Monty Python didn't sing.