Are you really saving more than the shipping costs for only 4 comics?
With the trade? You bet
That trade is $35 or so and I'm getting it for $17. Worth spending the $7 to save on that and the other savings on the 4 titles.
But even without the trades ... If I was just buying comics, I would only have to buy 5 comics a month to not lose the discount. With five comics only, ordering through DCBS, I save $8 (40% off each $3.99 book is a savings of $1.60 each book, $8 in savings total) and it costs $6.95 to ship. True, not a great deal of savings, only about $1, but still ...
With trades I will have no problem saving the $7 a month it cost for shipping.