According to what I know, in case of desktop applications, the revenue drops almost to zero, unless you have a Free and Pro versions. "Free edition" then lacks almost all features that make the product competitive, and it's not really good.

It's reasonable, though, if your potential user base is totally different. For example, IntelliJ IDEA has a Community edition that lacks enterprise frameworks support, but that's not a problem for "single users" because they basically don't do any enterprise. But it looks like it won't work for Marta.

So I'd rather choose the Sublime Text strategy (though I think that Sublime costs too much).