Porcelanosa used to do fixers a favour, in as much as they would tell customers that the cost of fixing a large floor would be roughly equal to the cost of the tiles.
If a customer paid say 30/sqm for tiles, why charge 10/sqm for fixing? Tile shop would only reduce their profit slightly for quantity, yet here we have a situation where due to quantity, the poor old tiler is expected to drop right down to day rate rather than make a tidy profit.
If all tilers stood firm on this, we'd all benefit!
Trouble is too many tilers and too much pressure to win a job.