My previous SaaS product, Navilytics, I built from scratch and ran completely on my own (minus a couple of blog posts from a friend). It very well could have been successful, but I made the mistake of thinking the product would sell itself and never did any real promotion leading up to launch. I paid for this as another competitor, who had the same idea I had at the same time and built their own version of the product, starting marketing it before it was even in beta. They're doing > $1 mil per year now in revenue.
Previous one before that was an affiliate network I ran with a buddy of mine, so just two people. We did very well with this one (but only mildly when compared to other large affiliate networks at the time).
My new project, I'm working with a buddy of mine who's good at the things I'm not so good at. While I think it's 100% possible to be a sole founder and do very well, having a solid team makes the entire process a lot easier. Plus, having people to bounce ideas off of usually leads to making better decisions.
Previous one before that was an affiliate network I ran with a buddy of mine, so just two people. We did very well with this one (but only mildly when compared to other large affiliate networks at the time).
My new project, I'm working with a buddy of mine who's good at the things I'm not so good at. While I think it's 100% possible to be a sole founder and do very well, having a solid team makes the entire process a lot easier. Plus, having people to bounce ideas off of usually leads to making better decisions.