The per location option is not always the best choice.
My most recent project (a 1-off picking up a tainted bottle of liquor from a consumer) would absolutely not be worth the simple $20 payment plus miles.
While the onsite time was less than 2 minutes, it involved almost 90 minutes of drive time up and back, plus time spent corresponding with the company about a bad phone number, purchasing the packaging materials (new box required), and communications with the end user to schedule the pickup.
I piggybacked this job with a route of Presto! gas stations and maximized the earning potential for the job. The mildly annoying task of keeping track of minutes is totally worth it in this instance.
Have synthesizers, will travel...