I agree. 30K is too low. Since there are a little over 40,000 zip codes in the US, this limitation means that you can't export data that has been aggregated at the zip code level (which MANY business people do). This is a severe limitation in my book.
It's a bit of joke this 'issue' as its not an issue at all - its a limit, implemented intentionally by microsoft in order to try and get you to export your data to their cloud! Why don't Microsoft put a note near the PBI Desktop download saying that there are limits on data export. No-one expects to be limited what data you can export, other than by your own hardware.
I got around this by publishing to my workspace and exporting (summarized data) from there and it worked successfully. We are using live connection to SSAS though so not a difficult option for us to do it this way.