FYI, the rules on when you need an EIN (from the IRS website):
Do you have employees?
Do you operate your business as a corporation or a partnership?
Do you file any of these tax returns: Employment, Excise, or Alcohol, Tobacco and Firearms?
Do you withhold taxes on income, other than wages, paid to a non-resident alien?
Do you have a Keogh plan?
Are you involved with any of the following types of organizations?
Trusts, except certain grantor-owned revocable trusts, IRAs, Exempt Organization Business Income Tax Returns
Estates
Real estate mortgage investment conduits
Non-profit organizations
Farmers' cooperatives
Plan administrators
If you don't require an EIN, I wouldn't voluntarily put myself on their radar. Once you've gone thru a business tax audit, you'll understand.