Well lets throw another yesbut /nobut into the discussion. The leasing company has to make a profit, pay the salesmans wages, the rent etc. On top of the cost of the van all this has to be paid for.
Money is only going one way, out of your pocket into theirs so you have to be paying for the extras over and above (and beyond ) the cost of the van.
The only person telling you what a great deal it is and how its the way all the smart businesses finance their vehicles is the salesman.
Money can't come out of thin air. somebody has to be paying his wages and the only person possible is you!
And don't fall for the line about they buy them cheaper than you can. When I bought my van I got a total off £3,800 off list price and Fiat, had I gone to them instead would have also given me an equally big discount plus they were doing 0% finance.