Of all the posts on this thread, I think that Nigel W has summed it up most accurately. Agreed. affluence is a movable yardstick but if we are talking present day affluence then price really does not come into it. Those people want it done and they want it done well. If you can provide that, then you should have no problem, in charging a sensible price. We do not advertise & all our work comes in through recommendation. Admitted, we operate in London & Surrey but affluence exists throughout the country.
If you produce first class work, are reliable, can string a coherent sentence together and appear at your clients looking presentable, it is completely unnecessary to have to start offering these customers "special offers". Am sure that if on top of that you start offering them all kinds of discounts, they will happily take them on top, but that part will not be what decides whether you get the job or not