Monopoly isn't the most technically accurate word, but behaviorally I'd say that Digi-Key is acting like a monopoly. Typically monopolies like to hold on to existing business practices rather than adapt to changing market economies. Regardless of 'good', 'evil' or 'monopoly', it seems to me that it is inevitable that online price comparison will start to become the norm for most markets. Digi-Key's reaction to this is very monopoly-like (in another world, they could choose to work with us and make sure they get the lion's share of traffic from our site).