While there are many reasons to completely ignore Logos book cache, I decided that subscribing might prevent me from feeling forced to cancel my larger prepubs and cp orders when they ship. Even though this is comparable to going to your local book store every month and purchase nothing other than a none-refundable store credit, there is something comforting about it as well.
I would like to suggest that this concept could be expanded and improved a lot. Certainly the book cache will help me get the pre-pub discounts, but then again so will a dedicated savings account at my bank (which also pays interests) or even a piggy bank. The store credit that I get from my book cache subscription really has nothing to do with this discount, and I can just as well spend it on resources which are going at full price.
But it does not have to be like that, and why should there not be some distinctive advantage to the customer who provides Logos with a steady and predictable income. There could e.g. be a bonus. The "Get a $50 subscription and you receive $60 in credit" kind of thing. Or there could be a standard discount for those who pay with store credits. I have a similar subscription with a store that sells audiobooks (but which shall remain nameless). There I purchase one credit each month, which amounts to one audiobook, regardless of what it otherwise costs. And as a subscriber I receive 30% off any other purchase.
I am a theologian and not a businessman. I am just saying, that the book cache could be made much more attractive than it is right now.