I consider weight quite important, but I am mainly a comp rider....when doing the worlds, a light bike could mean the different between winning and loosing. Its not all about going bigger, its about being able to go for longer, you dont want to be knackered 1min in a section, so a lighter bike helps that way. BUT, for comps, there are other things beside weight, you could use the lightest tires and rims, but the performance would be worse than if it weighed more but with stable rims and tyres. its all about combrimise