Why some drains block again, and again
Tree roots do not break into a sound, sealed pipe out of malice. They grow toward moisture, and a drain that has developed a crack, an open joint or a displaced section is releasing exactly the signal they follow. Once a root finds that opening it keeps growing inside the pipe, where conditions are good, and it becomes a permanent net catching everything that passes.
That is what makes root blockages feel so unfair. The drain is cleared, it runs perfectly, and a few months later it stops again in the same spot. Nothing was done badly — clearing removed the roots, but it did not remove the opening they came through. The invitation is still there.
This matters more on any property with established trees or long-standing garden beds near the drainage line, and it is a fair thing to raise if that describes your place. It is not a claim about the suburb; it is a claim about pipes and roots, and it applies wherever the two are close together.
The decision that follows is about arithmetic rather than plumbing. Clearing a root blockage restores flow for a period. If that period is getting shorter each time, you are paying more often for less. At some point the cheaper option is to find out where the roots are entering, which means putting a camera in the line rather than another cutter.