Ed Buffaloe's article is fine. Has some good information.
You can mix Rodinal 1+100 if you want. You'll get pretty much the same results as 1+50, spent more time developing, and save 5ml of developer. If time is your priority, 1+100 will be a detriment. If money is your priority, 1+100 will gain you very little. It's up to you, really.
What you can to at 1+100 dilution is to slow down your agitation pretty well, which gives you the ability to control the tone curve a little bit, and you can also get more shadow detail, because you're developing longer.
This article is profound: http://www.apug.org/forums/forum216/...-negative.html