For reference, here is a sales chart of Ghostbusters comics from IDW publishing. Will be updated when new data is released.
On August 14, 2017, sales for July releases were posted. Ghostbusters 101 #5 sold 5713 units, up 295 units from 101 #4's 5418 units sold. Comichron 7/2017 sales 8/14/17
On September 11, 2017, sales for August releases were posted. Ghostbusters 101 #6 missed the cut off and was not on that list. 300th and last place was 5621 units so at least, implicitly it did less than #5.