Purely means that the cheaper and more accessible the place, the noisier it is. Can be used to describe suburbs filled with babies, migrants, bogans and multiple fast-food outlets - not forgetting the vape stores. There is always some helicopter circling over a cheap noise suburb at 4am, most likely due to multiple feckholes doing dodgy activities down some dark alleyway.
I willingly pay excess $$$ for rent just because I refuse to be surrounded by the tragic implications of cheap noise.
Cheap noise is pauperism at its finest.