In Udemy's case, I don't think the sales devalue the product, so much as the 'regular' prices are an attempt to inflate it. Semantics perhaps, but if you frame

In Udemy's case, I don't think the sales devalue the product, so much as the 'regular' prices are an attempt to inflate it. Semantics perhaps, but if you frame it that way then their strategy makes sense: they're not cheapening a premium-priced product, they're giving a premium sheen to a low-priced product. The downside (setting aside questions of morality and consumer law) is that it makes them look a bit dodgy, and also they presumably have some upset full-price customers who only belatedly realise they've been taken for suckers. Sidenote: can you get every course for $12.99? I've recently started using Udemy, and I've cottoned on to the fact that if I'm not getting 80-90% off I'm doing it wrong, but it seems that the real prices range from about $13AUD - $30AUD or so. Is there a way to routinely get the (nominally) more expensive courses at the same price as the cheaper ones?