I really think (like Kevin the Frog) that "professional" is used as a popular keyword and search term. That's also the reason you see Ebay puppets titled -
Professional Muppet Sesame Street Fraggle Style Puppet - or similar. The seller is trying to drive traffic to their item, so the use terms that are more likely to be searched for on Ebay or elsewhere for that matter.
Here's something else to think about. If all advertising was truthful - a lot of billion dollar companies would be out of business - and I'd have a lot less stuff.