Who's Talking and Markers will always be free for Guild Wars 2 players. We strongly believe that both applications are great for strengthening the community, either by making playing together more awesome, or by giving players the ability to create content for other people. This is why we don't want to exclude anyone from using these tools and decided to make and keep them free for the community we're a part of.
On the other hand, projects with this complexity aren't created over the course of a weekend. We're professional developers and we already sank hundreds of hours into the development of these applications. Eventually, we'll have to balance this out with our work life and free time.
So if you want to give us the ability to further expand and improve our applications, we'd be grateful for even the smallest donation. Even if it only helps to cover the server costs (or the coffee, for that matter) it already makes a difference.