That's not how decile funding works. A school decile is worked out on the basis of the mesh block data from census returns. It reflects the socio-economic status of the catchment area, not the actual school population. So if locals send their kids to a school away from where they live (say to a school with a higher decile), the decile of each school does not change.
My 6 year old discovered cricket in a big way in January - the perfect confluence of a love of sport and a talent for maths. On the subject of pricing - we got a four match membership (GA seating) for the Blues for an adult and a child for $96. I reckon that's good value.