My first impression of MO caches was that because a smaller group had spent money on the sport they would be a more hardcore group, but after reading the forums for a while, it's obvious that isn't the differentiator. The thing that makes each find unique is that it's entirely at the discression of the cache hider. I think this appies to their choice to go MO or stay public.
Given the earlier posts on statistics, its definitely not like MO cahces are hindering the game in any way, so I'm viewing them as just another category, but definitely not somethign to raise my hackles over.
I paid for a membership, like many others, because I think this site is the most enjoyable one out there (meaning no offense to alternative cahcing sites!). gc.com is a very professional layout, very functional (just got into using pocket queries), etc. There is very little that survives without money, so I view my membership as a contribution in appreciation for this site (which I used free for my first year of caching as a "try before you buy" period.
Thanks to Jeremy for a fantastic site and it's contributions to caching, and thanks to all the cache hiders out there for making it interesting when unplugged as well!