You can’t expect them to give you everything they have. They still need to make money. The way I’ve been using this service is as follows:
I’m trying to get through the New 52 and get to Rebirth by the end of next year. This is a long and EXPENSIVE endeavor. I often wait for sales on Comixology, dumping up to $60 on discounted volumes. These might save me money in the long run, but dumping lump sums like the a couple of times a month can hurt me when I have bills and/or rent to pay, plus other comforts. So, before I buy anything on Comixology, I check to see if it’s here first. If the full volume IS available, I just saved $11.99 or $12.99. If say only half the volume is available, I still save money buy simply buying the remaining issues for half the price of the book. This service only costs $75 a year, and provides me a chance to save more money in addition to providing a platform for a brand that I love. I’d say that’s invaluable to a consumer like me.