You might find this 'helpful'
We have a costings spreadsheet. It starts with our default day rate and then takes into account the number of repeat days and a whole bunch of things to come up with a recommended amount that we charge the potential client.
One of the columns included is headed MBI which starts off at 1.0 but gets changed up and down depending. MBI stands for Moany Bastard Index: it's not unknown for a client to have an MBI of 2.5 which means, all other things being equal, our day-rate for them would be two and a half times our day-rate to someone else.
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