But do you think there are many designers who think that they are anything less than a Rolls Royce? (Just like most programmers think that they are much better than average)

Here you are getting into the difference between the quality of the designer and the issue of setting a budget range.

After all, to put it in those terms, you can rent a Rolls Royce for a day - or you can buy one.

Perhaps a better analogy is a vehicle?

Do you want a skateboard, pushbike, car, ute, truck, van, lorry, bus, juggernaut ...

If you're looking at car brands then you can get the same vehicle priced differently according to the badge on it. Then it looks like you're saying the cost of a website varies according to the pedigree of the designer more than the technical specification. This is true to some extent but not perhaps the answer one is trying to give.