I have to agree, but I don't know what the business model is here. I am sure Nokia would rather you buy a Nokia phone than just buy Nokia Drive from the store. They also don't want to directly compete with Garmin, Navigon etc. who use their maps in their navigation programs / devices. So if Nokia starts undercutting everyone on GPS apps, then they are going to hurt their NUMEROUS partners who buy their maps. So this is really a much bigger than HTC Windows phones, it's a big part of Nokia's business.
In saying that, I don't know why the heck they said they'd offer it to other OEM's. Clearly they couldn't work out the right deal / terms. It's really hurt Nokia in a lot of ways because I think a lot of people bought the 8X over another device, thinking they may get Nokia Drive. People that have bought the 8X under that assumption are also unsure who to be angry with, Nokia? HTC? Microsoft? In the end, you just don't get what you wanted.
It's easy for me to say 'just buy the Nokia', but I get that if you want an HD Screen on Verizon you only have one choice. In saying that, there is going to be more and more stuff coming from Nokia. Going forward it seems there will be more options for devices though.