50 shots is fine with me.
To me, "too far" depends on the risk of losing my arrow. 50 yards in an open, grassy, field? NO THANKS. 50 against a hillside or bales? Absolutely. "Hunting distances" don't have anything to do with 3D - otherwise every target would be within 25 yards.
I don't like the shots that risk arrows - I've seen targets set at the edge of a swift, cold river with no chance of recovery if you miss. Then there's the target in a rocky creek bottom or sitting on or against a boulder - busted arrow if you're off by a little. It's one thing if they're set at 20 yards, but sometimes these will be long shots. No fun if there's a $10 arrow at stake.
I like the novelties, the crazier the better, as long as I don't break or lose arrows. Zip wires, rocking horses, pop-ups, speed shoots and so forth are all in good fun, but if you're scoring, you should not include them - just clearly mark them as novelties that are not for score.