eBay; 30 day vs Good Till Canceled

I always run things good till canceled. It is easier.
However, I always thought it would be best to run things every 30 days, and then wait a couple days between relist. Say, if you waiting 3 days, each time, you would in effect save 10%, which in the long run, would be more then the profit on the likelyhood of sales in that period.
So if, instead of 10%, I in the end save 5%, because of a missed sale or two, off the listing fee, and since I am running about 850 right now.....I could have saved a little over $4.00! Not enough to mess with or build a program to do such...but numbers look good?
However, I always thought it would be best to run things every 30 days, and then wait a couple days between relist. Say, if you waiting 3 days, each time, you would in effect save 10%, which in the long run, would be more then the profit on the likelyhood of sales in that period.
So if, instead of 10%, I in the end save 5%, because of a missed sale or two, off the listing fee, and since I am running about 850 right now.....I could have saved a little over $4.00! Not enough to mess with or build a program to do such...but numbers look good?
Collecting PSA graded Steve Young, Marcus Allen, Bret Saberhagen and 1980s Topps Cards.
Raw: Tony Gonzalez (low #'d cards, and especially 1/1's) and Steve Young.
Raw: Tony Gonzalez (low #'d cards, and especially 1/1's) and Steve Young.
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So $0.40 savings on 850 listings? Maybe?
Edit to add:
I guess, it might be good to do this....only in your lower sell through items. If for example, I could figure out the 10% worst sell-through items, and just do that to them. Manually relist them.
Raw: Tony Gonzalez (low #'d cards, and especially 1/1's) and Steve Young.