I'm not saying they are worth $60, but the zippers on cycling jerseys are nice to get some fresh air either on a really hot day or on a cold one on the way up a big hill. With a t-shirt on, you don't have that option. And for what it's worth, I've tried wicking t-shirts for riding but they are no where near as nice as my jerseys (Pearl Izumi, Nike, Sugoi, Hind) in terms of breathability and overall comfort.