The one I visited only did the visitor thing a few times a year as fundraisers, and even then it was up to the animal (wolves and wolf mixes in this case) to even be visible to us. A few came out, some were interested and more tame, and others were only glimpsed during feeding.

Many were either injured or too old to be released.

The main things with keeping these as pets is being aware that tame is not the same as domesticated, and also to make sure even legal in your area to keep as a pet.