How much do you weigh? I (used to) regularly drop off of stuff a foot or two and I never had any problems. My bike wheels can't have come close to that price. (I did need to move to downhill tubes as those kept getting pinches).
I weigh 165 pounds / 75 kg and I do this on a fairly large roadbike (I'm 6'1.5" / 187 cm). Are you slightly overfilling your tires? Say 90 PSI if the wheels are marked for 80? I found that really helps. But I do still get pinches fairly regularly.
Yeah, I'm kinda crazy with the thing. I've been considering trying out some stuff at the BMX park in Toronto really early in the morning so I don't get laughed at.
Tall guy who used to bmx here. Never broke a spoke but munted a few few wheels and one set of bearings. I dearly wish for a bmx scaled up by something like 1.3x or 1.5x. My neck has never recovered from the stupid head-tilted-up pose that bike forced me into. Loved the bike though!
How tall are you? We've got all kinds of stuff for tall people. Check out 24" BMX bikes (aka cruisers) - a cruiser with a long frame and 7" or 8" bars would probably suit you well.