On a more serious note than my previous post, as a glider pilot and tug pilot I do have problems with set altitude circuits, to date to my knowledge circuit altitudes apart from Secondary Control Zones (or what ever they are called these days) have been recommendations only – I will check the docs when I get to the office tomorrow
As a glider pilot – try flying a level circuit, and before some of you go off on tangents, while many gliding operations are from gliding paddocks, there are also many gliding operations conducted from licensed airfields (CTAF) and in rare cases CTAF (R).
As a Tug Pilot – having towed to 2000ft agl which what is considered a standard release height for gliders, and still being in the “circuit” most tug pilots I know make a continuous decent using a miliary style circuit, and even with a mix of traffic I have never experienced any conflicts that could not be sorted out with a bit of common sense and consideration for other airport users.