Atleast driving it stock gives you an idea on what you could get once you buy it, since obviously you've never driven that car before.
You guys dont get it, the idea is to have the chance to drive a car that you are interested in, and know more about it, also, it could make you buy the best car, but only if u want. Dont try to be other people's minds.
There is not much point in driving a stock car, because its handling will change completely when tuning it. Imo viewing it in garage is enough.