(note: Has since been resolved, thanks for the responses. Feel free to add you opinion in case someone does a search in the future and finds this thread...)
I went back 10 pages and couldn't find anything to help me so figured I'd post up.
I'll be shooting two vehicles on Sunday. They are owned by the same customer. I would normally just charge a flat rate per vehicle ($250), give them edited images on a cd that they can do with as they please.
However, this customer wants to see the proofs first and then just buy the high-res file of the image they want so that he can print them himself. This is the first time I've come across this so don't know how to quote him a per image cost.
On one hand if I quote $20 an image he would have to chose 25 files which probably won't happen, maybe...I don't know. If I did something more like $100 a file then I think it's more likely he would choose 5 files, but probably not any more. However, would someone even chose 5 files...who knows.
I have only been dealing with the person who was modifying his vehicles so I only know about this guy second hand until now. The customer, owner of vehicles, has seen my work and likes it enough to consider buying the images and is requesting a quote from me.