It's Government Motors for goodness sakes. When have they ever taken the effect of taxes on anyone into consideration? As for raising prices to offer rebates, that is the American way. If offered a choice between two identical trucks, one showing a price of $40,000 and the other a price of $45,000 with a 10% rebate, the vast majority of people would choose the $45,000 truck with the discount. After all, in their minds, they are getting a $4500 rebate and a $5,000 more valuable truck, even though the trucks are identical. Doesn't matter that the $45,000 truck with the $4500 rebate ends up costing $500.00 more.
Psychology is one of the most important components of sales success. As it applies to RVing, why do you think RV parks offer one price and then offer a myriad of choices to get a 10% discount, where almost everyone eventually can qualify? The lemming public is more interested in how much they get off than they are in how much it costs.