I think you're right Joe! It seems that the high quality Springfield Sporters were appreciated previously, but not thought of as collectables. It also seems that the many poorly sporterized Springfields were dragging down opinions about sporterized military guns in general.
There certainly weren't many people who did as much as Michael to inspire others to collect them as he did. I wish someone would do something to bring appreciation to the various other nicely sporterized single shots of the past. Seems most people look at the old sporterized guns as abuse of an original, and want to disassemble them and restore them to original. That's great for the poorly done guns, but sacrilege to do so to a finely reworked old gun!