Very logical when not busy .... but on a sunny Sunday in the summer? I think OHJ's are a disaster waiting to happen when busy, so tend to ask for a different join in such circumstances.
Pretty logical on a busy day as well in fact (provided you're turning in the correct direction). The idea is that if it's busy at an uncontrolled airfield, you remain orbiting in the overhead at 2000ft until there's a suitable gap in the traffic to allow you to safely descend. Visit White Waltham and you'll see this in practice on most busy days (albeit at 1300ft).
I would counsel that to do a non-standard join at an uncontrolled airfield on such days is asking for trouble. If a particular airfield has a non-standard joining procedure (such as if parachuting is in progress), it will feature in the AIP. If you need to "ask" to do a non-standard join, then by implication you have an air traffic control service and you are required to follow their instructions anyway.