Most people are more interested in genuine people, then nice people.
Most "nice guys" are just schmucks acting nice because they think it's what they have to do to get a girl. "nice guys" pick one girl and decide to be overly nice (read: creepy) to her and get discouraged when it doesn't work. If you notice one thing about guys who are succesful with women, it's that they don't let rejection/failure bother them.
Off topic:
I'll summarize why for you.
Most people are more interested in genuine people, then nice people.
Most "nice guys" are just schmucks acting nice because they think it's what they have to do to get a girl. "nice guys" pick one girl and decide to be overly nice (read: creepy) to her and get discouraged when it doesn't work. If you notice one thing about guys who are succesful with women, it's that they don't let rejection/failure bother them.