He would get stakes ONLY... if they want pins they also get a new plat and a hefty price tag, explain the reason for the plat and the additional fee.
In CA there is little distinction. The function of identifying and marking a property line is the same either way, as is the representation. The difference is in the materials used to do it.
The surveyor has the obligation to have performed sufficient work to verify the boundary before identifying it for someone else no matter how it gets marked. Additionally in CA, there is the requirement to set durable monuments when marking a boundary.
Reading the OP, it sounds like a good client who simply doesn't understand the liability that he would be asking Mr. Church to take on, thinking of it as a simple task of sticking wood in the ground as if for a construction stake. Rather than taking umbrage and assuming the client is deliberately trying to get you to stick your neck out for some paltry fee, providing a reasonable explanation as to why the request is more than it might seem may lead the client to ask for something else which does not add to Mr. Church's liability, or he may authorize a reasonable fee and allow reasonable time to verify the boundary and set the monuments.
Educate before you castigate, you may end up with a better informed client. Do it the other way around and you may end up with an ex-client who is no better informed than he was before the request in addition to being confused and angry about his ex-surveyor's unexplained hostile response to his last staking request.