Hadn't happened yet, but I might not notice or care. I'll admit I felt like on was on Tapas Island for 6 months until I found the forums. (my first was a sub4sub, so naive back then)
But seriously, don't let it bring you down, lots of people have ADHD these days, and suffer from reader's burnout, and may feel the need to clean out their subbed libraries. Me? I'm still subbed to Executioner's Academy(2 year hiatus, i think?) and my loyal Scorpio butt won't drop them for nothin'.
(Actually, if I hit the 25 milestone, and then someone unsubs to be a d*ck with me, ooh. I'd be so mad! >:C)