By buying a car you don't really want? Oooookaaaay...
If you want a BMW, then that's fine, nowt wrong with them. If you want to try and free some cash up by downgrading, again that's fine and I see the point. That doesn't look like what you're trying to do though: More just buying a new car for the sake of it. Again, I've done that myself so I see the point there, but you're trying to say that you can do everything and somehow magically come away with a wonderful car that sends Sarnie to sleep and a billionty quid in the bank. I just can't see it myself. As always, and as others have said rather than the 'Go for it!' I think you've read it as, if you're happy then that's all that matters.