Not to mention the minima are fairly high on the SRAs. We had a bit of fun a few weeks back when 06/24 was shut and it was 12/30 late at night. It would also mean when you're flying an NPA on 24/06 you don't end up scaring traffic on the taxiways - the NDB aligns you with the taxiway rather than the runway.
They clearly don't do too many SRAs at EDI Radar either.