T Roc New car purchase as daily registration

Dear community We have decided on a 1.0 special model iq Drive. Exactly the extra equipment we need, a few extras and everything fits. At the VW center I was granted 14% on the LP and that was also my ideas. I know the seller personally for years – that doesn’t always have to be an advantage – but you just trust yourself… Only hook if it is one: I pick up the kfz in wob with license plates of the dealer, so is on him At home and then return to me immediately. So day registration. At the guarantee nothing changes for me, we will want to sell the car only after years… I read the dealers bypass so discount specifications of the dealers and on the way you can “give more”. 18% I had been offered if the car runs 4 weeks on the dealer and he drives in time with it…. would be 1100 discount extra but my wife wants to drive the car from the beginning and after d have not yet negotiated what discount I get if the kfz is registered to me and remains… Have your experience with it. Are there significant disadvantages if it is a daily allowance thanks Fromm