Post your entire collection, and watch your hits column in the library. If they stay zero for more than 15 or so minutes, people aren't seeing them.
If it goes up to like 10 or 20 something within minutes, many people are seeing it, and you shouldn't have to worry at all.
If they all go up by one suddenly at the same time, someone is browsing your collection.
You can be the judge if you are getting activity though.