STANDSTILL agencies know clients make them profitable.
STANDOUT agencies know if they have unprofitable clients.
STANDSTILL agency owners might have a profitable agency, but they may also have unprofitable clients. They just don’t know it. They probably over-service some clients (but don’t do anything about it).
STANDOUT agency owners know when they have unprofitable clients. They monitor the profitability of ALL clients individually.
If they are over-servicing a particular client they take action and do something about it.
Which clients make you money (and which ones don’t)? If some clients are unprofitable you – and your other clients – are subsidising them.
If you have the power to make them profitable, do it.
If you can’t make them profitable, don’t work with them.