I think it's fine!
But you might place links to both the online store and their eBay storefront.
I don't know enough about the back end to know how that would work.
But I know within my eBay app there is no readily apparent URL.
Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with a Holley 80508 and Performer intake.
Too much other stuff to mention.