Avenza isn't some little app developer; they are really big business in the cartography world. Look at their MapPublisher; it's $1400 alone for a plugin to Adobe Illustrator. My beef with them is they were free, although I assume they got a cut of the maps that were sold through their store, kinda like Apple's App Store. Their corporate office trumpets the fact they had downloads from the store in the millions, and they encourage the businesses that make maps with their products to use the store. Fine; didn't mind paying for some good maps.
But now they've decided to charge me, in effect, to use my own maps. Meh. Like charging me for a frontend to their profit center store. If it gave me better value than just that, I'd say fine. Although Garmin and others charge just for the maps, not the app to use them (Basecamp eg).
Meanwhile, the PDF maps I bought from their store still work, at least in their own app. I shoulda bought them separately so I could use them with other apps. My bad. I did find TerraGo; more useful in it's layout and interface than PDF Maps. PDF Maps doesn't give you much info, or allow much customization. I use (and pay for) GaiaGPS, but it's raster maps. WAY better application and service.
So I'll keep searching for alternatives, but thanks though.