Let's just make the DPS tool personal. I want to see my personal dps, i don't need others to know about it or know theirs. Then, people will be able to shout their number if they want or not.
Improving dps is not only about rotation, it's also how you react and use your time to dps in encounters (my main dps is BLM). Giving numbers only on dummies woudn't help me that much.