You shouldn't consider Jet.com not collecting sales tax as a "good thing" since you are technically required to pay it by law (in most places, normally, afaik, IANAL)
So you technically do still need to pay that 8.25% differential.
Indeed you do. Many years ago I had a business. One year the state decided to audit my business. No biggie, I had paid all my taxes as required. Except I hadn't. My business was located near a big box warehouse and you could order on the website and go pick it up. This was when almost all online orders were claimed to be "tax free". I did that for a few hard drives and some other stuff. I ended up owing about $150 in back taxes and penalties because I hadn't manually figured out the sales tax I was supposed to pay and reported it. I was a little annoyed at my accountant whose reaction was, "Yeah, nobody pays that, though technically you're supposed to." Needless to say, I have a new accountant.
> Many good accountants will weigh the chance of you getting audited + fined against the ROI of an "oversight."
"Good" is a questionable descriptor here. I would think that a good accountant should follow ethical rules, which would exclude the possibility of knowingly breaking the law to under-report taxes.
So you technically do still need to pay that 8.25% differential.