An autobuyer is a program that works either in the main shops, user shops, or the Igloo Garage Sale. You load a list of items that you want the program to buy, these items are all going to be ones that are stocked in the shops for cheap so that you can resell them in YOUR shop for more-- Hence making lots of $$$. Once the list is loaded, you set the program to refresh every so many seconds, most people say 6-8 seconds I believe. Then, when the shop restocks, your autobuyer will automatically try to buy items that are on your list. It won't work ALL the time, but you have a better chance of getting the items with an autobuyer than doing everything manually. Although, with these programs, there is a usually a moderately high chance of getting iced. So in order to avoid this, don't run an ABer for too long. Some people say not more than a half an hour every so hours, while others leave theirs on for a few hours at a time every day or other day. The idea is to make it look as HUMAN as possible, so that it doesn't look suspicious. Hope this cleared things up for you.
I wish the Igloo ABer on this forum had a proxy, I can't figure it out on my computer, so I'm just taking my chances on it.