Prices vary everywhere for a myriad of reasons. BTW, I love this quote
"The right price -- the one that will extract the most profit from consumers' wallets"
No shit Sherlock. The goal is always to charge the highest price the market will bear. This is nothing new.
What clueless douche doesn't realize is that the article is really about which sale price will produce the most sales with the highest profit. What dipshit anti-capitalist doesn't realize is that there are websites and tools that consumers can use to maximize they buying power to get the best price.