Because the odds of success are extremely low
The odds of:
– Finding someone within your age range
– Being in close proximity
– You like them
– They like you back
– You both find each other attractive
– They’re single
– They’re looking to date
– That you share some interests or hobbies
etc etc
And then you add in the competition too, keeping in mind you’re competing with like 100 other guys for the same woman