As Derek says, your purchase is being funded by a lender who will obviously need to add interest which is what happens with your house, your cars / vans, etc.
Very few will pay out £3k or so when there's no discount incentive and the £3k could be earning £'s for the business through marketing, adding expertise or whatever.
You might get a better financial deal these days from another source than the leasing companies, worth looking into, eg, your bank / building society.