That they're new and shiny. Doesn't do anything for me, I will walk (or scroll) right past it without thinking twice, but I'll stop to look at something cool that is original. I guess it's similar to how some people don't like Schwinns, or some only collect muscle bikes, while others only collect prewar bikes. Just personal preference.
The fact that many people use the word restored incorrectly, doesn't help. Seems like the majority of "restorations" are either overdone, or done incorrectly with wrong or missing parts. To me, in order to truly restore something, is to bring it back to exactly how it left the factory. There was a guy on ebay not too long ago selling a "restored" bike, where everything (including the tires!) was spray painted black. The word just gets tossed around too loosely.
If I personally had the ability to do this, I still wouldn't, simply because I prefer original. If someone else were to accomplish this, I don't know if I'd like it or not without seeing it. It would probably depend on the execution of said restoration; however, nothing beats original.