This is an already aged discussion which really at first, it's quite confusing for some people.
There are lot of kinds of gambling which for me gambling really acquired huge percentage on "luck" some could be skills (depends on what gambling)
While on trading, I can see the huge percentage here is skills and somehow on the other part, there's luck here but a very small percentage.

So for me, trading and gambling are far different from each other. Because trading is not only for luck.