[domid]

I think a large part of identifying a successful leader in a company is to see if he/she has the potential to lead. A leader should be able to excite others around an idea and convince them to follow and devote their time and energy. This is difficult to do early on, specifically if there is no money involved. In not being able to find a co-founder you are basically saying, you can't or you don't want one/need one. If you can't, that might be identified as a negative trait. If you don't want one or feel you don't need one, I would encourage you to reconsider. There is nothing like having someone beside you, you can fully trust, and talk openly with about your problems and frustrations.

Working on a startup is something like swimming in an ocean with a one mattress that's loosing air. You need to swim to an island which is far far away, and although the mattress might have enough air to help you rest from time to time, there is a big chance everything might go wrong. Sure you can do it alone if you try hard enough, but there is a bigger risk of you getting there to late or not getting there at all. With 2 or more co-founders, you have someone beside you can trust, and that might allow you to rest, or plan out a strategy so you all get to you destination sooner than anyone else. Trust me when I tell you, you aren't the only one swimming in the same direction.

I'm sure you can find a handful of companies that had one founder and succeeded, but the odds of them succeeding are just much much smaller and it is a bigger risk most investors want to avoid.