I'll tell you what investors told me - without someone else in the business, you don't have a business.

Of course, everything depends on the particulars of your specific situation and what you are looking for. But if you're looking to raise funding, they are going to want to see a team. A) so that you pass the "bus test" - that is, if you got hit by a bus, would the business (and their investment) continue to exist? And B) because investors weigh the strength of the team almost above the strength of the underlying technology or service.