I just tried to do a dummy booking YVR-YYZ. For a Tango fare, the standard options of no baggage and no changes were offered.

The last time these options were offered, I remembered them to be $5 and $7, respectively. Now, they are $3 and $5, respectively.

For Tango+ fares, the "no checked baggage" option is also offered for $3.

I guess $2 per option must be yet another revenue contributor, though now I am almost certain that for $8, I, personally, would be taking neither discount if I was flying.