I wouldn't start an enterprise software company w/o a technical person either. A non-technical sales person from an enterprise company won't be aware of the acute pains the customer's IT/engineering departments have. They'll be able to make sales pitch, but given an equal sales pitch by Oracle/IBM/SAP and a start-up-you-never-heard-of, which one (as a non-technical manager) would you choose?

As I've said earlier, the best person to start an enterprise software company would be an applications engineer/field sales engineer/professional services consultant from either a large or fast growing enterprise software company.

Not only will they know how to sell, they will also understand the technology, be able to program well enough to create a prototype, be interview developers, know how to support the customer, deal with the end-users and know most importantly what the end-users want (best enterprise software is the enterprise software employees are begging to install).