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What if there isn't any content on the redirected domain? Would there be any reason to, or reason not to, forward a blank domain that is only relevant because of that actual domain name?

Still using shoes: I have 2 domains, SHOES.COM and DESIGNER.COM. Shoes.com is where I sell shoes. Designer.com is the name of the shoe designer. There isn't any content on Designer.com, but it's the name of my shoe designer...so it's relevant to shoes.com. Should I forward the domain to Shoes.com?

How many times is it OK to do this before taking an SEO hit?

I manage a site the sells product A and product B (both major keywords for us). If I buy the url www.productB.com and redirect it to the original website, would the original website gain any benefits in search engines? Would the benefits of having a url with the keyword be lessened because there isn't content hosted there, only a redirect to the original site?