Answer:
In paintball there is very little use for magnifying crosshair scopes. The greatest magnification you would ever need is a cheap 4x scope, and that would only be accurate for a few guns, with impeccable paint to barrel match. The only guns that could use a scope accurately are the T4 first strike, and the SO longbow.
Most "snipers" use red dot or reflex sights, because it allows you to show where your shot will go(as accurate as paintballs can) and will not give you tunnel vision. Some scopes also cannot work with a paintball mask on.