I try,too many times to do a good job whith wrong materials.After the job done I'm not happy with result,the client is not happy,so what is the point to do this?Money?Not,you lose more time to fix the cheap tiles then good tiles.Reputation?Noone after couple of weeks tell''Yes,the tiler do a good job with my cheap tiles''.I'm too old to try to do miracle!For miracle,stll searching the tools....Wrong walls?Can be fixed.Unlevel floor?Can be fixed.Wrong tiles?Can't be fixed,just try to do acceptable!