https://dor.wa.gov/get-form-or-publication/publications-subj...
What if they end up selling it for more than it is estimated to be worth in something like blue book?
Is that considered profit?
(I have several companies in this space)
Unless the laws in their state are solely based on volume, they are almost certainly acting as a dealer, which requires a dealer license and a bunch more legal requirements. In most states once someone buys a car with the intention of reselling it rather than using it, they automatically become a dealer.
Though in my state, in excess of 5 vehicles per year they start to care, and prefer you hold a surety bond -- which as of a few months ago, I do for an amount well in excess of the transaction price of the vehicles I typically sell. I also now have a dealer plate, which never goes on anything because some buyers would get weird if they saw one.