Yes. The only people who can use MacOS X 10.4/86 are Intel Mac users. However, these users already have MacOS X 10.4/86 because it shipped on their machines. The bottomline is that there is no legitimate demand for MacOS X 10.4/86 DVDs.
I think by "Universal" the original poster just meant "Will install on any Mac" (as opposed to "eMac-only Reinstall Discs"), rather than "Universal" as in "will install on any Mac, PPC or Intel".
If I'm correct about what you meant, they're probably ok, but I'd be a little careful just because it is eBay. If you already have 10.3 installed, MegaMacs has a passable price for a legit Tiger upgrade DVD: