just about to pay ATO now.
SNIIP is indeed charging 1.5%, however this includes GST! so 1.3636% ex GST vs YP at 1%
pretty much coming to the same cost/pt for me (0.012 YP vs 0.01196 SNIIP)
here are the calculations...
| ATO via SNIIP AMEX |  |  | 
| payment amount | 10000 | $ | 
| surcharge ex gst | 1.363636 | % | 
| points per dollar | 1.125 |  | 
| points earnt | 11250 |  | 
| surcharge paid | 136.3636 | $ | 
| points earnt on surcharge | 153.4091 |  | 
|  |  |  | 
| cost of 1 point | 0.012121 | without surcharge points | 
| cost of 1 point | 0.011958 | with surcharge points | 
 
| ATO via YP Dragon |  |  | 
| payment amount | 10000 | $ | 
| surcharge ex gst | 1 | % | 
| points per dollar | 0.825 |  | 
| points earnt | 8250 |  | 
| surcharge paid | 100 | $ | 
| points earnt on surcharge | 82.5 |  | 
|  |  |  | 
| cost of 1 point | 0.012121 | without surcharge points | 
| cost of 1 point | 0.012001 | with surcharge points |