Agreed. I started out solo in an incubator and had to be RUTHLESS with my time. Basically didn't really make use of the mentors / sessions / etc - too busy writing code / making sales calls. Didn't spend time networking with the other startups - too busy trying to network in my industry. Didn't spend time on pitch competitions etc - too busy trying to find real investors who knew me and knew the space.

I've since added a co-founder, but we more or less still operate the same (probably a bit to our detriment).