Scuppers are great but have dis advantages. Especially for those of us not fortunate enough to ride surf all the time. I ride surf rarely so I see no need in a scupper. I like to leave my ski sitting in the water on my anchor while I take a break and know that it's not going to sink. I can leave mine for hours, no troubles. But if you beach your ski every time you stop, then a scupper shouldn't cause you any trouble and will dump the water faster than a bilge.
I run two bilges in my X2. I usually only run one in the lake, and two if I'm in the surf or stabbing or something.