I've been working with gravity forms for several years, so I buy every year it's developer version, and monitor the changes of the coding . Because I use the gravity forms on my own-built websites (forex we launching now the ghd - hair brand's hungarian website, wich uses also gravity), I always have to extend it's functions for the demand of customers. I monitor github threads often as well as I have my own gravity snippets (not published). The desired function is an easy export function, what I have already written for several customers. It's no time form me, the one day is more then enough with the full test of the exporting process. If something - heaven forbid - will became buggy later (because of -for ex.- some WP/or wp-plugin update) in my code, I update it for you free of charge. I think this is the minimum.