Church Micros- What's the Point?

I notice that a lot of geocachers are very taken with the idea of bagging Church Micros and with the publishing yesterday of a dozen or so within a few miles from home, the question which has been bugging me for a while now cropped up in my mind. "Why are they so popular?" I'm not dissing CMs. I have published 3 of my own ( two of which have had more logs than any of my other caches) with a few more to come in the near future. My motivation for publishing them is to introduce cachers to some lovely little churches in our neighbourhood which they will hopefully go in and explore. But is exploring the churches the reason cachers hunt out the church micros? My most popular CM is at Ranworth in Norfolk with an historic rood screen and stunning views from the tower over the broads. But in 83 logs so far only 23 actually mentioned the church at all in them, although of them at least half did venture up the tower. 

My question to those interested is why do you place and/or seek out CMs? Just curious.