the pricing page is delusional... you don't get 7000 executions but 10h hours of processing time per month. you can buy additional hours per month ($1 = 1h). The thing with the "7000" is based on an assumed execution time of 4 seconds per workflow execution. My workflows currently range between 20 and 90 seconds. far away from 4 seconds and far away from 7000 executions (~654 executions = (20+90)/2).
you could actually create a script with buildship to log your executions, calculate the average, and show your milage (similar as in speedometers: 8.7L/100km)...
you can review how much gas is still in the tank here: https://buildship.app/p/<your instance>/settings/plan or you just manually navigate there via the web interface.