Besides not being a particularly nice comment, this shows a lack of understanding of how many, if not most, people listen to music. I might listen to a new song or an album quite a bit the first few weeks after I first hear it. Then after that, unless it's in like the top 100 or so songs I really love and seek out regularly in my music, it just goes into the shuffle with the literally thousands of other songs I like.
So if the OP's song came up in the free trial or I happened to hear about it somewhere, and I check it out during the trial and really like it, I might listen to it a dozen times or so. Total amount paid out for all those listens during the trial? Zilch.
And then maybe I'd listen to it maybe a couple times a year after that, if it's lucky enough to come up in the shuffle? I'm sure there are Beatles songs that I haven't listened to in years just because they haven't come up in the shuffle. Not because I don't like those songs, or don't think they're worth paying for, but just because they don't come up.
When you're being paid based on the number of listens, that's potentially a lot of lost revenue during the free trial period.