I know most people who post here do not visit due to perceived risks of corruption. Personally, I had Avril & Batterson fairly early on due to the personal offers system when I started playing. I found that, perhaps due to the twice doubled kudos, visiting was a decent source of gems. Typically I'd get Hyde 5 or 6 times total, and a gem pop from houses every few visits. All told I'd come away with at least 12-15 gems per day, often more.
I haven't been visiting for a couple months, due to lack of any real need to speed things up. This morning I am chilling out and decided to make a full clear. 67 visits = 3 gems total. 1 hyde, 2 house gem pops. Mabu 2 or 3 times. I know one sample isn't proof, but that sure seems unlikely to be just bad luck.
ps. this is just idle speculation, no need to get up in arms.