Bit of a thread jack I suppose (maybe not...I guess this might be something beginners do...) but, CGR, I absolutely MUST agree with you.

People that clog up the runway just absolutely get on my last nerve. One guy in particular comes to mind at my field.

This fellow has been flying for several years...I've seen him land everything from a trainer to deadsticking a several thousand dollar giant scale. He's a very competant pilot. But let someone decide to prepare for a take off, and suddenly, he's got all KINDS of trouble making a landing...makes 6-8 approaches and then says 'oh, sorry...need to go around...came in a little hot/slow/offline/turned around/disoriented/uncomfortable/_____ on that one"

I mean..ok...we all have approaches that aren't up to snuff...and we all wave them off (or at least later wish we had) and go around for another try. But it's becoming OBVIOUS with this guy. He almost NEVER botches an approach, and on the rare occaision he does, not ONCE have I seen him botch 2 in a row. But by golly, let someone be waiting to take off, and he'll make 7.

I guess that'd be what I'd offer as a 'beginner mistake'. If you wanna practice approaches, or do touch and go's, or work on taxi skills...whatever...fine. They are valuable skills to learn. But please do so when you're not sharing the field with another pilot. IMO, if anyone else is in the air, or waiting to get there, then get your plane on/off the ground as smartly as you can (don't, of course, risk your plane or spectators doing so) and leave the runway open for takeoffs and landings.