This is the wrong way to ask the question. It is not a numerical "How Much?". It's not that a good looking guy will get X more women than an average guy (he will). But. In reality, a good looking guy lives in a totally different world than an average guy. A good looking guy will have experiences that an average guy will have trouble even comprehending.
As an example, I'm a good looking guy. When I got a promotion, one of the employees, who was an actual model, hopped on my desk, stuck her a$$ in the air and said: 'do you need a sexratary?".
As another example, I linked up with a desert hiking group in SoCal. One of the participants was a 21 LVU y.o. student. Long story short. Without even knowing me, she hooked up with me in a motel in BFE within an hour of meeting me. We didn't do too much hiking.
I was a at a bar in the Marina in SF. As I was walking by, two girls called out: 'Come over here and talk to us!"
I could go on for days with stories.
The downside is, I'm not a very good BF nor a very good employee. I just get treated well because I'm decent looking.