Speculation is based upon assumption
, there is reasoned speculation/assumption, and presumptious. For example, if you were to say that you think it's going to be cold tomorrow, we can assume that you are doing so reasonably, based on things like "how warm was it today", and "what weather patterns are moving into place for tomorrow". If, however, you said it was going to be 40F tomorrow, there would be a higher expectation of proof on your part. How did you determine what the temperature is going to be? What qualifications allow you to make that determination? Etc.
Once you bring out numbers like "over a million copies downloaded", and "over one hundred thousand people would have bought it", you better have some evidence to back that up if you want to be taken seriously. Which I assume you do.
If you don't want to be taken seriously, disregard everything I've posted, and continue your "speculation".