Comment by crazygringo

Yes, there's a difference in the number of items you're selling.

There isn't a difference in terms of the fact that it's advertising a sale. Nor is it relevant if you're doing so personally, as a sole proprietor, as a partnership, as an S corp or as a C corp. Advertising something for sale is advertising something for sale. Ads are ads.

Also, on the realtor's site they're listing hundreds of homes. Not any different from your local car dealership advertising their hundreds of vehicles. They're both corporations listing ads.

Advertising is advertising.