I do use an ad blocker. Why? Because the ads that obnoxiously pop up on Flyertalk are always the same for me. Either for a Chase Credit card (which I already have) or for a Hyatt Credit Card (which I don't want)
I don't mind banner ads but the pop up ads that FT uses are more than annoying.
If there was some variety I might be inclined to take the blocker off but they are both very annoying.