This is not always a bad thing. Because yes you might gain a couple of referred subscribers. But even if you don't and they sign up within 30 days you can gain the pay for the read time down the track.

I had a story that was similar, and it picked up a spike of 800 views one day. 4.2K over a few months. But on three random occasions, I saw between $1 and $2 added on to the income, with no read times on those days.