Yes agreed - when the initial buzz comes off - you soon look on the drive and know your £35 will soon be £10k!
I borrowed my mate 320D 55k miles 2007 the other day and thought - I would stick miles and miles on that and feel nothing..
Its a hard game... sell the F10 pocket 10K and drive around in a 320D coupe for couple of years and then choose a 2 year old 4 series. Or stay.