Jim thats well and good, however they will get a tiny amount of traffic and if your selling anything you need traffic as its your life blood.
Theres nothing better than good old SEO to get you noticed, if you go to google and type in Earn $$ looking at naked women, my site is listed at top position, and thats without paying a cent in advertising. How did I do it, I used Ebay! Now thats done, I don't need them anymore!
As you say, there are good and bad points of using Ebay, as a seller the bad points out weighed the good for me...
Have a great day.