Some places do lifetime alignments, like Firestone service centers. It could easily pay for itself after three alignments. I've done this, and the equipment and procedures are exactly the same as a standard four-wheel alignment. About the only issue I have is that they won't center the alignment towards specs if an alignment check shows it's within specs. Some cars are a little fiddly with tire wear even if the alignment is within specs but near the edge of factory spec. If you pay for a standard alignment, they're probably do whatever you request, even if it's already within specs.
They may offer to do various repairs, but I've never been approached to have a service done that I didn't agree was necessary (and that I would take elsewhere or do myself). I guess this is one way they anticipate they can recoup their losses from doing alignment checks and re-alignments.