Even though I'm not earning money using ST2, I'm still loving it. However, there is always a feeling about price. And I think 70$ is a lot. Compare this to 30$

Even though I'm not earning money using ST2, I'm still loving it. However, there is always a feeling about price. And I think 70$ is a lot. Compare this to 30$ for Mountain Lion, 99$ for Aperture 3 and 129$ for Lightroom 4. Does this feel right? I'm not against paying in general rather I want to have a good feeling spending the money.