So just why do you want a clean sensor?  

Cleaning your sensor only takes minutes, just a fraction of the time you spend removing sensor dust in post processing. Having a dust free sensor provides you with the sharpest possible image that your sensor and lens combination can capture. If there is dust on your sensor, it is degrading the quality of your image even if you can’t see the hard specs. Dust always works as a diffuser and softens an area of your image. In certain circumstances, it will even leave a dark speck in your image. Content Aware Fill works wonders, but it takes time and still isn’t as sharp as if you would have had a dust free sensor to begin with.