Just about as reflective yes. It will get dingy/foggy (lam) before the 10 years. But the ink on the reflective won't last that long anyway. It will fade too. I'd laminate it no matter what though. Wouldn't want to reprint reflective if something happens to the print.
Why would you laminate it if it's not printed? It's not necessary and a waste of $.
Sorry I think you misunderstood. This is not printed reflective, it is plotted.
There's a big problem with graffiti/tagging around here and it'd be nice to be able to clean it if the paint goes over the lettering. Also it will be worth laminating if it will increase the lifespan of the vinyl without making it look aweful.