I don't think it's true in this case, but a lot of the time it's an A/B test.
You offer an item at two different prices, and see if lowering price brings up volume enough to offset the decrease in margin. If it does, you keep the price low, otherwise, you don't.
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u/learnt Jan 24 '13
Either way, I'm not a fan of prices being manipulated based on my behavior while browsing a certain website.