Poor Customer Support
Currently, I am System Admin for a company where my job is to make sure all of the servers are running correctly so all of the operations and services work like they should. Prior to this, I have worked at large and small companies doing various types of support both to outside customers and inter department support within the company.
The other day, someone asked me with all of my experience, why I didn't offer web hosting services. Apparently, a lot of people have been having a lot of problems with service offered by some of the big hosting providers and getting support is very difficult. I hesitate to jump in and start a hosting company because, I believe, I would loose money doing that.