I've mused about the steady stream of IPO activity in New Zealand several times of late, most recently this morning. Expectations have been high. However, the soft response to Serko's listing, and nervous chatter on various news and social media sites, suggests that the supply-and-demand equation may have reached a tipping point. Could this be? 

I'm not convinced. Good investments should—and generally do—attract good support, and weaker ones should be put to the torch. At the risk of being labelled as having a somewhat simplistic viewpoint, I think the market has simply woken up, such that it will not blindly support weak proposals. If this is the case, I'd call the situation by its proper name: common sense.