My suspicion is that it has something to do with the terrain where you live. I took a look at a 100 mile radius around Midland, TX and it looks like there are only about 89 caches that are not micros there. By comparison I hit 100 non-micro caches within 7.2 miles of my house (and there are more beyond that 7.2 mile radius). However, there are a lot of forests, swamps, and other naturally dense landscape types around here so it's easy to find ways to hide larger containers.
Isn't Midland primarily prairie? I would think that would have an effect on how easy it is to find places to hide a larger cache.
Carolyn
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Midland is more of a dusty place