Unless you believe it has a long-term value greater than what you're seeing today. I'd say the chances it goes up in the very short term are decent, but who knows.

I got in very small 5 months ago (literally only what I was comfortable losing which isn't much) and am still up, but have been debating whether to put more $ in. So far the answer, for me, has been no, since I'm kind of already at my tolerance level.