Here is my comments.
1. If everyone pays, it will ease congestion
Should have used fuel levy, then you could have built more roads and not gantries
2. It pays for the continued maintenance and upkeep of the road
See answer to point 1.
3. It makes financial sense
Does it make sense to waste money on gantries, while you already had the fuel levy?
4. It is the right thing to do
Putting in etoll was not the right thing to do, so NO, paying is not the right thing to do.
5. It eases the burden on the poor.
It worsens the burden, see answers to 1. and 3. again
6. It makes on-road services available which helps approximately 200 people on average per month.
What? You are starting to improvise on reason.
7. It has eased the automated payment option at all toll plazas.
Uhm, actually no, did you see the queue at Pumulani last Sunday?