Given that you can only submit one site/day most places, each day you don't submit you're leaving money on the table.
I don't know anything about GASS, but in my experience people who use auto creation/submission software fuck up a lot. The tenth time they enter their nick in the title field, choose the wrong category and fill the field reserved for special comments to the reviewer with key words it gets very easy just to hit the BL button.
Once you get your tables set up it's really not that time consuming to submit. What little time you save using auto software can cost you dearly in the long run in rejected submits, blacklistings and, ultimately, lost sales.
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