A price tag is ok. I buy tools in my business all the time (programming components, 3d modelling tools and more).

If someone has no need then he does not have to buy, especially since you can manually make your uv-maps and bake your light-maps in 3d applications for the second uv-set.

Tools like this are for the people who really have projects and limited time. If someone is in a learning process, then it might be better to do it manually, learn about uv-mapping, lighting, rendering and see what an awful amount of time it takes to set all this up for just a little scenery.