i don't know why guddulf's line bindings broke, and yeah they are heavy. where his broke though is not one of the areas that makes that binding heavy.
the point i am trying to make is that if you are abusing equipment and puttig it through types of use that it maybe really wasn't intended for, it's usually a good idea to get something that has proven itself to be durable. i'm not saying everyone here abuses their equipment, but it's clear that bindings weren't designed to be skied switch (or at least not most of them) and the brakes don't work right, etc.
most of the titanium used in the ski bindings is not a super strong ti mix and it does not hold up. it would be better to buy a full steel binding or something of the sort.
for all the mountain bikers here, we all remember what happened when the freeride bikes were just coming out and everyone was using light parts and breaking them all the time. then, heavy duty parts started to become available. they aren't the lightest, but you know that you can trust them not to break on you.