I have fairly meh feelings on the ebay thing, based on my experience (It doesn't help that I've hated ebay from long since). I opted to try posting a few pipes on there because I so often get complaints from people that everything is sold off the website by the time they get there - After every site update I can usually expect at least a couple of people to write me in frustration. So, I figured ebay would be a way around that - Put the pipes up for auction where everyone can look at them for a week and let them go to the highest bidder. Overall, though, my experience so far has been that while the pipes sell for higher prices than direct, the ebay "bite" erases that advantage and you just end up having to wait longer to get paid. A simple example - I put up a Christmas pipe that was $640, IIRC, and it eventually sold for $675. Ebay takes $70 of that and Paypal another 3%, so I ended up making less than what I could have sold it for off my own site. It *does* give buyers more of an even chance to get a pipe if they really want it, but I have not thus far found it to be an advantage for me as a seller, and that's not even getting into ebay's horrible reputation for seller treatment and seller protection.
Regarding the percentages, you can't really wholesale to ebay because you still have to do all the sales and marketing and photography work. While the pipes may have arguably more exposure (Which is very debatable, as my email list has gotten pretty large over these past 16 years), it's not actually any easier to get the pipe photographed, posted, written up, handled, measured, etc. The only time wholesaling is workable is when you can turn all that work over to a retailer to do. It's a common misperception some folks have, the old, "Well if you're going to wholesale a pipe, why not sell it to me direct at a discount?" and the simple answer is, all that work would still have to be done then.
As an aside, sometimes it's also completely impossible to wholesale - A lot of the more complex Talbert Briars I make, for instance, I simply can't discount to wholesaler levels. If I'm going to get back my labor hours, I have to sell it direct, because the labor time probably ends up being 90%+ of the pipe's price. OTOH, with pipes like our Ligne Bretagnes, it works out well, because literally half the total working time of the pipe is IN the photos, sales, marketing, and shipping, so I make the same money either way, whether I make it and put it on my own site, or make it and sell a box of them to a retailer.
Re: ebay. I'll probably still put a few pipes on there every so often. It is a good way to give a broader segment of the market a shot at a particular pipe, instead of the pipes so often going to whoever has their phone buzz first when I sent out an update notice. Basically, you try to mix & match your approaches to get the pipes out to as wide a market slice as possible while still keeping the business profitable.
I hope that helped explain a little!