Got a great question for you. I think I got ebay on this.
So ebay has this awful policy where they state you are not allowed to attempt to make off-site sales.
In other words, if you makes sales on ebay, you can't contact those buyers and tell them you got your
own online store where they can just purchase DIRECTLY from you next time thereby saving money
for the buyer and the seller on ebay fees. Even if you HINT at attempting to doing it, you can get restricted and even banned forever….