Nets are just screwing themselves. If they charge the same as credit cards, then retailers will not prefer them over credit cards. This will increase the use of credit cards, and lure people to borrow...
You may ask... why are they screwing themselves?
The reason is clear... Nets is owned by the local banks. Local banks, being the dominant players in the local credit card market has a strong desire to see to it that the use of their credit cards go up. If you Nets, money is deducted from your account, and that's the end of the story. If you card it, there is a chance that you may carry over the amount owed for some time, and so the banks earn some hefty interest. Which channel do you think the banks want you to use?
So, raising Nets fee is actually good for them if you look at the bigger picture. The amount of transactions that go through those seedy shops in SLS are a small part of the whole payment landscape. So, they can afford to lose these... and they don't really care if you were to go to the ATM every time you want to buy your camera or lenses.
So... Nets raising their fees is really bad for you and me, but very good for them. Sad right?