The are really shy fish. I have had mine for at least 8 months and he does come out once in awhile, but not very often. He will scurry back to his cave if any movement is detected outside the tank.
I feed mine Hikari algae wafers and zucchini. If I sit quietly and watch, he'll come out and eat in front of me. As soon as I move even a little, he is gone!
I like him, but am going to move him out to another tank or rehome him for three reasons: too much poop (I like a cleaner look), an unconfirmed suspicion that he attacks small cories that come near his cave (I lost too many of them that were perfectly healthy until they went in that tank), and his shyness.