Employee services in a given country can be up and running in a very short timescale.
No need to set up expensive, complex company infrastructures = low risk and minimal investment.
Ability to acclimatise to new markets without heavy upfront investment and risk.
Commitment can be limited to length of contract.
Minimal legal fees and no compliance issues.
Existing employees can be accommodated and/or new employees can be recruited.
Global project management with local support in any location.
Central project management means single source responsibility.
Simplified, strong communications.