So i've eaten about 200 downvotes in this thread for stating that inactive bases get removed after a certain period of time. I estimated it was around two to three weeks based off some of the threads i've seen here over the last year.
I decided to scavenge threads here to find the many times I had seen this phenomenon mentioned. I believe this is what happened to OP. I wanted to provide a single place for all the things I had found because I had multiple comment threads going from many people telling me I was full of shit. So here is what I have found:
First off, screenshots showing off this phenomenon. Large periods of time without being attacked. They were found in this thread, and most people posting provide context.
http://i.imgur.com/hgI4lw6.jpg
http://i.imgur.com/Uvubryb.png
http://i.imgur.com/I1mCltb.jpg
http://i.imgur.com/pXgDRoR.jpg
http://i.imgur.com/h5O68yR.jpg
Here are text responses i've found about this phenomenon:
First from Reddit Raptors Leader
It is 100% true that the algorithm CoC is using to match players is causing inactive bases to go weeks without being attacked. Probably to make people buy more gems.
I made no attempt in any of my posts to comment on whether or not bringing more loot into the game was a good or bad thing. I was just stating a reoccurring theme. The 200 down votes I received compelled me to relieve many of you of your ignorance on the subject.