I thought that the following was common knowledge but recent events have shown that it is not.
As far as 3SI is concerned a business is anyone that:
1) Makes a part to sell.
2) Has a storefront or website operating for sales.
3) Anyone buying multiple cars for the with the intent of selling them, rebuilding them and selling them or parting them out.
Wither or not your sales constitute a "business" is up to the sole discretion of the moderation staff and the owners.
If an business wants to sell on 3SI they need be enter into one of the sponsorship packages that the forum has to offer.
If you run a business and post sales in classifieds you risk:
1) Having the sale deleted.
2) Having your seller verification removed.
3) Being banned from classifieds and loosing all of your PM access.
If you are concerned about your status PM Lord Warlock or DPFSharkBait and they will help you determine if you are a business.
If you are a business contact
sales@autoguide.com about sponsorship packages.