never done it in 30+ years of climbing. top ropeing stuff that is meant to be led is weak sauce
what is with all the yo yo crap anyways. climb to the top, make an anchor and bring your partner up. enjoy the view. Seems like a lot of modern climbers do not even enjoy being up on the cliff. as soon as they get up there they holler to be lowered.... you know we never did have loweing accidents BINTD.....
The last time I remember doing it was late one afternoon after leading Standard, Pegasus, and Dracula. A couple friends show'd up late while we were finishing Dracula and we decided to take a few TR laps on it as no one was around (it was about 4 pm) and the climbs was just too fat and plastic to not have some fun.
Fun. That's what it was... Taking 3-4 quick TR laps on the right side of that route was brilliant fun (I had already led it)...
I think one would ruin it for themselves if they TR'd a classic like Dracula before having led it a few times, but as long as you are not hogging a line from someone who wishes to lead I see no problem with it, but highly suggest this as a very late in the day activity... I certainly wouldn't have set up a TR on it had it been earlier in the day...
TRing is a great way to improve your leading techniques... seriously, I've dialed myself in when not worried about bodily harm then gone on to lead scary Grade 5's the next day much more comfortably... I don't see anything wrong with it if used appropriately...