OTOH, perhaps this means the glass is half-full. 
I'd be more concerned if there was a box of dead logic boards...because those have got to be harder to repair given the combination of obsolete and/or custom digital chips that would be impossible to troubleshoot with "just" a meter and difficult to physically replace.
As per my earlier premise, MTH would be the other end of the "business" perspective. I figure their "burdened" labor rate would be higher than you or GGG or the other usual suspects. What would be interesting to see is the procedure/process by which those power supply boards ended up in the box. I figure somewhere in there is a check to see if a Wincap (or whatever that cap was called) is installed...and if so replace. For all we know, there might be another 1 minute test such as a particular diode that changing would solve some percentage of failures. Etc..
So as a "business" proposition, there must have been a line-in-the-sand where MTH told their techs to spend no more than X minutes on a board then just toss it in the box. We know the replacement parts cost of the diodes or capacitors is essentially negligible. So it was all about time equals money. From a "hobby" perspective time does not equal money. That's what makes Paul's quest interesting. I now step down from the soap box... 
Addendum: I stumbled across this OGR thread where @tansqrx reports 20-30% success rate with PS2-5V board repair. That's a very encouraging batting average! He also posted a detailed troubleshooting checklist. 
