Because:
a) The game would be to boring
b) There is no recognition from BB that the behaviour that we all complain about is a bug so if we wait for them to fix it we may as well quit now
c) It isn't buggy on every adventure every time so its like a lottery and we do like a lottery
d) We live in hope
e) We are deluded
I for one have stopped doing Fairytale adventures and concentrate on the smaller quicker adventures that don't seem to exhibit the same issues so often. For me that's Pirates, Bandit Nest, Traitors, Surprise Attack and the occasional Black Knights.