This is an incorrect, unrealistic way to view this. By using the Tor network normally (you argument certainly applies to doing overly traffic intensive tasks like torrenting over Tor) you are normalizing its use, protecting those who really rely on it. If the only people using Tor were criminals and people who needed the protection, listening on Wifi networks for connections to Tor could lead to immediate prosecution (look what the UK is trying to do with encrpytion, and that French case where all of the evidence against a suspect was use of open source technology like Tor.) By default, Tor does not hide the fact its being used from your network (thats what a bridge is for), so the more people use Tor, the safer everyone is.

If you really want to help those that need Tor's protection, run Snowflake on your desktop or Orbot's 'kindness' on Android. This allows users to use your device as a bridge, bypassing censorship in other countries / networks.