The major competitive disadvantage of the garmin panel is the high-cost proprietary subscriptions. It makes sense that they wouldn't emphasize it.
Many of the competitors have helpfully summarized the costs on their websites, when they are cheaper. I haven't seen any that are dishonest or inaccurate, although of course everybody emphasizes their advantages, and tends to minimize their weaknesses.
My uninformed guess is that fewer than 10% of the garmin portables get regular updates, and that the number would be much bigger if the cost were lower. I don't know where revenue would be maximized, but I'd guess that it would be at a significantly lower price in the experimental/handheld/LSA market.
Hopefully someone at garmin will at least try the experiment, maybe "recession" pricing that could be made permanent if there is a significant increase in revenue.