I think it's a pretty long bow to draw to call it a cash grab by apple though, think about it for a second, the vast majority of accessories that I see are not genuine apple products but cheap junk that generally are a much lower quality so as far as I can tell most benefit will go to the companies that provide these, is it not possible that the new port is just evolution of an old design that as your link says has been around since one of the original ipods.
iphone is by far the most popular phone on the market right now but to label these people as fanboys/sheep is just too weak of an argument, it's just that it's a good phone thats looks nice and is easy to use.
My mrs has a 4s, my mum has a 4, and my dad has a 4. They are 3 typical people who have Apple stuff that are in no way fans of Apple but happen to have their products. Now all three of them bought car chargers but none of them are from Apple so I don't see a new port design being hugely profitable for Apple as a whole, sure the small percentage of die hards will spend more on genuine but I'm sure that will be a grain of sand in their vast desert of profit.
My mrs took this pic on thursday night it paints a pretty good picture of how popular iphones are, I'm sure most of them are just typical users as well. I use a 7 year old samsung flip phone before you throw me in that basket.