Ask HN: How much traction a single founder must have to get in YC?

I knew I wouldn't get an interview this batch. I am single founder, with no previous success and no tech background. But I just shipped a product that I am selling to restaurants - a SaaS loyalty program based on Facebook check-in, my current price is ~U$70/month. Today, after one week selling it, I have 2 clients. How many clients must I have in 4 months (next batch application) to impress YC even with all my obvious red flags?