Nah, it's standard. The wholesale cost difference between 1HP, a 1.5HP and 2HP above-ground pump is usually small. And, given the whole American 'bigger is better' ethos, the pitch, 'And, just for you, we're throwing in an upgraded 2 HP pump' is a sexy and effective sales line.
Offering a new-to-pools customer a 22" filter instead of a 18" filter is much less 'sexy'. Plus the 22" filter costs significantly more at wholesale.
For the most part, it's all about what will sell, and not what will work well.
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