I, too, joined Ebay in Jan 1999. Ebay was amazing back then. It seemed to be mostly collectors, no big companies. An item had to be pretty awful not to sell back then.

Bids came in fast and furious and they came in early. The bidding wars were such a thrill (when you were the seller

) The fees were decent, it was easy to list cheap items, and finding that long lost childhood toy could bring tears to your eyes. Collectibles that used to take months and years to locate through magazines, newspapers, and for sale lists via snail mail, could be yours with the click of a mouse and be in your house within days.
So, in my experience, I would say Ebay's heyday was anytime in the late 1990's to about 2001. I feel that's when it started to go downhill. Now, the fees are insane, most of the fun is gone, and unless you have something you know will sell or you actually like selling on Ebay, it might not be worth the time/hassle. I used to sell a lot more, but now, months go by when I haven't listed a thing.
Some things actually did get better since the heyday, like the ability to avoid the long lines at the post office by printing shipping lables online and having your mail carrier pick up your ebay packages. So it is not all bad.
Ebay has gotten too big, too confusing, too expensive, too everything, but there are some things that are best sold on Ebay, so for that it is still good. For artists, Ebay can still be good. And for buying certain items you cannot find anywhere else, Ebay is still good. Ah, but I long for the heyday and all the fun that went with it.

tink