There are a lot of factors involved in negotiation a bonus. Is it the end of the month or better yet, the end of the quarter when MSC's are more desperate and therefore more co-operative? Is your trip a pleasant ride through the countryside of a grind through cities? Can you add more shops in route to the destination shop and will this make the route an overnight trip?
A shopper several years ago offered a very simple formula - a buck a mile. If I am called by a MSC and they want an answer on the phone that is my guideline but I will invariably tell the scheduler that I will get back to them.
I have a detailed formula on the computer that I put the figures in - shop fee, bonus, tolls and mileage. I allow $.50 per mile as my car expense and that is automatically calculated. Mileage, travel time, shop time and report time is entered. The result gives me the ratio of income to expense, Gross per hour which includes travel and shop time, Net per hour which includes travel, shop and report time and Net, Net which is Net less expenses.
This sounds very convoluted and time consuming but the hard work was putting the formula together. Now i can determine a requested bonus in a matter of seconds. I know, I know, your are now thinking that's crazy but it works for me.
In any case I encourage shoppers near me to get maximum bonuses. That helps my business. Shoppers automatically taking shops at base pay hurts my business.