That's true. I guess my thought is, why focus on the introductory beers. They'll be different for everyone and will be mostly dependent on who is doing the introducing. If you have a well stocked beer list, respected by the people who can appreciate it, they will organically pull more people into their circle.
I have a friend who is from St. Louis and loves his hometown beer, Bud. He lives here in Dublin now, and after having been dragged constantly to the Porterhouse, he eventually got curious and started sampling new beers.
Maybe a guiness tap, a BMC/Heineken/Budvar tap, and then everything else should be well chosen, highly prized brews that people can grow into? A frequent drinker card (buy 10, get a freebie) that you can only get nice beer with?