How much do you charge per hour? How many hours is the task going to take you? If what he's offering you is more than this amount, then it's a fair offer. If it's less, ask for more.
I'm not trolling I am enjoying the discussion and the pointers. I am charging $1000 per month to keep clients ranked and traffic coming into their websites. I also have charged $3000 up front for first month. I got these numbers from a seminar I attended in Dallas with Kevin Wilke. I used to charge a lot less. I felt like I was underselling so I raised my prices, upsold clients, offered money back guarantees and had some success with that. However this year was a little slower, I have tried a few other pricing models too.