A lifetime is an awful long time. That said, never underestimate the power of the vector image format.
These are highly scalable, visually impactful pieces of creative for your projects. We use them mainly for accents, backgrounds, and presentations, especially because they project so well. And by project, I mean we once gave a presentation to a prospective client as we walked outside a trade show floor with them, by projecting our presentation and proposal on to a building across the street. Vector formats work perfectly for this ;-/.