I also look into other guys presets how they combined a certain amp and a certain cab and how they set up crazy effects, I guess that's what everybody is doing.If I only started from scratch, I would have missed many examples of amps & effects that are now in my presets.
But when I build my own presets for live use, I always use a similar template, my template, and I import the ideas from other's presets into my structure. That way I never risk to loose the overview in stuffed up complex presets and I know my stuff and I have a solid ground to improve from there.