From my knowledge it's because most or all dealerships are financing their own products or land with mortgages so as the rates go up so does whatever they are selling.
Maybe not the workers but the owners are living with their own financial problems, they took out loans to get the product to you and as the days go by they're losing money as the product's value is going down.
I know a lot of people have the stigma of dealerships/salesman being scammers or whatever but as person who shortly worked in the industry and understands it somewhat it's can be fair most of the time.
It's business, think about if you took out a loan to have something to sell and it's just sitting as you have to pay overhead costs and still try to make a profit?