I don't see the appeal in trying to push a rim to its absolute limit in the name of frugality. Take the case above, it is a $30ish rim that lasted well over 30k miles, the cost per mile is incredible there already. Should that rim fail at speed it could cause a nasty crash that could easily cost you thousands in medical bills or at the very least a few days down because of being hurt. All to save $30 ($70 if you have to pay someone to build it). I get trying to squeeze the most out of expensive components like cassettes, chain rings, hubs, etc but tires and rims are too critical for me to get it. You did claim we would not see you being sensible though.