From Scott McCloud’s Site:
Now we actually have the opportunity, through a potentially more efficient distribution channel, to get prices down AND bulk up the page count (no printing cost for pixels!). Letâ€™s not make the same mistake twice.
Rule #1: Is your comic a satisfying read?
Rule #2: Is the price low enough that your readers wonâ€™t mind paying it again and again?
Rule #3: See Rule #1. Repeat.
See the rest here