You are right
I hope Yokomo will release the hubs in plastic too. Alu can be quite expensive, so less interesting for lots of people to buy.
So far I've only snapped the hubs on a indoor track (with a wood like boarding) last winter. No problems outside, so far. Even my driveshafts are lasting forever. And I run pretty fast motors because I like a overpowered car.
My rear and front arms also live forever, but i've replaced them a couple of months ago, because they had a little slop. But lots of people would still race with those arms. I use them as spare now.
Curious about the front hubs though. Once available, I'll post pictures up on bmax2.eu