Many suppliers want you to have a sales tax ID from your state to prove that you are a legitmate business, and not just a consumer / part-timer. It proves to them that you have a real business.
And, for your own protection, you should be charging sales taxes on any sales delivered within your own state, unless you live in one of the few with no sales tax. If you are selling and not collecting the sales taxes, YOU are responsible for them, whether you collect or not. Plus, you will be subject to penalties and interest.
It is in you best interest to get a sales tax number ASAP.
Here is a link to more on the subject -
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