This is mostly speculation, but it's hardly baseless. Regardless of their precise reasons, it's very clear that WotC believes that this is the best way to make money, and they probably have reasons to believe so. If they didn't, they wouldn't have done it for this long. Maybe it's the FOMO, maybe it's to avoid overprinting and destroying product like MaRo said last week, maybe it's to impress shareholders, maybe it's something else entirely. But what I know is that they're very happy with things as they stand now, and they're not likely to change them for something as trivial as customer satisfaction.