Why not share some actual facts and data that show results? I know it sounds pretty far off base but have you tried treating successful business owners with respect for their ability to digest marketing opportunities and predict ROI instead of trying to bullshit them into buying something that you yourself seem unable to understand or describe?
Being tech-savvy has nothing to do with it. "Spend this money, get this process/action/etc., obtain these results" is about as straightforward as it gets. If a business owner doesn't have a grasp of this process, it's unlikely they will be in business very long.
Facts are important yes but you still need to explain what SEO is. No bright business owner is going to buy something they don't understand. That being said, analogies are horrible in this situation. You're better off just explaining it to him in a simplified fashion because yes, you do need to respect the person.
boatBurner, I would explain it like this. Google delivers very high quality customers because searching for certain things via Google shows that this person is interested (ie. high intent).
SEO is a way to ensure that when customers search a certain phrase related to your business, your company comes up on top (ie. high visibility). It's important to be as high on this list as possible because it's implied that whoever is on the top of the Google search list, is the best match.
At this point ask, "any questions thus far?"
Then explain how certain keywords deliver more exposure because they're more popular.. ask them a rhetorical question, For example, "Which word "Pepsi" or "Barqs" (or whatever less popular soda)" is going to get searched more? So naturally, Pepsi will deliver more exposure than Barqs.. but it will cost more for the word Pepsi because lots of people want a slice of that pie.
At this point ask, "any questions thus far?"
So by delivering more high-intent customers to your page, is how we're going to improve your bottom line. This is when you show data like tangy suggested. This is what I want to achieve with your business and all it costs is $_____ to get started. What are your thoughts?
Keep in mind the sale starts after you hear the first no. And once they're committed to the idea, is when you can upsell them for better LP's and whatever you want to upsell them to.