Why doesn't tom gamble

Here is a quote from Chapter 23,

Will and George were gamblers and often tried to entice their brother into the joys and sorrows of venture.

Tom said, “I’ve tried and it just seems tiresome. I’ve thought why this must be. I get no great triumph when I win and no tragedy when I lose. Without these it is meaningless. It is not a way to make money, that we know, and unless it can simulate birth and death, joy and sorrow, it seems, at least to me--it feels--it doesn’t feel at all. I would do it if I felt anything--good or bad.”