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So, make the sane price after-tax, and display the pre-tax price to 100 decimal places (or whatever).

Honestly, even if this is only done for the "critical path", it can still make life easier. I pay $4.16 for a large latte at Starbucks. It would be easier if it was $4 or $5. I don't care if the price is easy for two lattes or if I get a half-caf skim extra hot latte with 94 extra espresso shots. Just make the basics simple, and you will save a lot of effort.

(Profile, then fix the slow parts.)

What's the reasoning for this policy?

I always find it frustrating when I visit the US dealing with pre-tax price stickers. Thank you Oregon for not doing this. :)

Are you sure?

Fenway Park and Gillette Stadium show post-tax prices.

Many places get exemptions. If you look, you may be able to spot public signs that cite the exemption and under what law they have them. I don't know about everywhere but I remember seeing such signs in Cedar Point (an amusement park in Ohio) about a decade ago. (They've since lost their exemption for whatever reason, so don't go looking now.)