Thanks for the info, Biscuit. Now that you mention it, I remember reading that before -- makes complete sense.
NOW: I should mention that I'd already forgotten that the original question was about linking to one's Auctiva store. Oops..
It does seem like it should be okay since it's a collection of your eBay listings and nothing else. However, as Biscuit suggests, some people will report a listing like that and even if it is eBay legal there are no doubt plenty of eBay employees who would kill the listing not knowing any better.
Of course, the other thing is -- if the rule quoted by Biscuit is the only rule that applies to this topic then it technically is against the rules, I guess.