Hey Bro. Yes it could work for someone like you with 3000+ Positive feedback, But for someone like me who just started and have few feedbacks (In my case less than 100 since I just started the method last month). THANKS TO YOU!!!!
But if someone in my situation gets even 1 neutral or negative feedback can effect ALOT I believe.
I personally lost 8 bucks on an order because the price gone up on amazon but l preferred to pay it out of pocket rather than get a negative feedback; Also, few days ago I got an order which I've been listing it in very first day of starting the Method and when I got the order I found out it's out of stock on Amazon. I contacted the buyer, apologized for being out of stock and told him my supplier misinformed me and used all those technics that you thought on the first post. but at the end, customer wasn't exactly happy with the situation and I had to send him 3 emails back and forth to calm him down. I consider myself lucky that he didn't left me any negative feedback.
So I guess a tracking software would be a GREAT help but I haven't found anything myself or they were so expensive.