This should come as no surprise:

"More than 70% of consumers told Hostway they’re unlikely to purchase from, or even return to, a web site after encountering a pet peeve. And, because only 25% of consumers say they’ll complain to the companies about their pet peeves, the use of features that annoy consumers may be having a negative impact that’s difficult to trace or measure, Hostway says."

Read the full article at Consumers get turned off—literally—by top consumer turn-offs at web sites