I think the success of Something Awful is, by and large, despite Lowtax, and not because of him.
Eventually you weren't 18 anymore and that "edge lord" persona that Lowtax brought to everything wore thin, or other "edge lords" started to get more attention, and also then eventually we all found out that Lowtax wasn't an act and actually lived his life that way too. But I know for me the era of Something Awful I most paid attention to SA, most of that was for Lowtax's sense of humor and the young naive kid both I and the internet itself was at the time.