The last company I worked for paid strictly by the award but refused to pay the hard lying allowance for night stops at mine sites. Margins were thin and it could have made a difference to the profitability of the contract.
A couple of years after I left they went into administration and ended up being taken over by the main client, a logistics company who were used to screwing subcontracting truckers into the ground, who they had no trouble replacing when they went broke. It was a bit harder finding another turbine operator to step in a short notice so they ended up having to buy the company to keep the freight moving.
As has been stated before, margins are tight and it's easy to end up on the wrong side of the drag curve where profits are concerned. We had a youngster destroy both engines on landing one night with a bog down. Hundreds of thousands of dollars gone in a few seconds.