"You won't know until you try": Of course I agree.

But I was underlining a reason why many men would just become discouraged and stop their approach.

Many women have no idea how low is, on average, the success men have in approaching women. The same happens when women complain "Why men do not do courtship anymore?". The reason is: because most of the time is just time (and energy, and money) wasted. Hence men try to minimize their losses.