That's a really cool approach, but taking the time to rip the disc means you get the extras and other features that were on the disk, along with a significantly higher quality encode of the content.

If the focus is on quantity and diversity, I can understand just getting a decent-bitrate MKV or MP4 of just the film, but it might be worth it to see if there are Blu-Ray rips of the media in question "around" before just grabbing what's out there; at the very least, complete (and perhaps even decrypted, since that's finicky) rips have reasonable value on private trackers.

I'm guessing this sort of thing has probably already been taken into account.