(18 Apr 2014, 7:45 am)Dan wrote You went on a Saturday, didn't you? A number of Lothian's services operate at a decreased frequency on Saturdays compared to Monday - Fridays. Go on a weekday and you'll find there's not as many buses still sat in the depot.
I went on Friday 4th April, but it still looked like there was quite a lot of Buses sitting in the Depot though from what I could see from the main road outside of Central Depot.