Hi, at present you do not get charged for turning off the SG, counters, battlebids or any other of the bells and whistles this warning message may come up on within the free Auctiva site.
Auctiva makes it's money from various other related sources, features like the SG and Sellathon counters help advertise the Auctiva site and tools. If no one used them at all then sometime they may need to start charging everyone but at present you can turn off what you do not need or want.
At present I prefer to keep the SG enabled as it is a very useful feature if placed appropriately in your listing and just hide items as necessary e.g. to bias the SG to a specific group of items you have for sale.
Anyway you appear to be ok now which is good