I doubt Svitzer came in on a "no cure-no pay" contract, after the ship was grounded she was obviously already heaviliy damaged, possible too damaged to salvage in one go. I think they have negotiated a fixed price-contract, possible working from day to day.
The present "no cure-no pay" contracts are no longer "no pay". The salvage companies have to do a load of investements in equipment, manpower, are always on short notice st-by to go all over the world. Nowadays the contracts always award the salvor with a certain amount if he manages to save stuff, protect the enviroment etc etc.
More info here: http://shipsbusiness.com/salvage-contract.html
but can also be found readily available on the internet, use the famous Google & you'll find mor einfo then you'll be able to read or comprehend. ;-D