The membership against buying titles

The membership is a borrowing arrangement. Where its own page describes getting a title it says 'Borrow from a selection of thousands of Great on Kindle eBooks', and its terms speak of the titles you selected from the programme rather than titles you bought from it.

Buying hands you the title itself. It is the only one of the two routes that leaves you something once it is done — the membership gives you nothing to keep, because what it lends stays in the catalogue.

Nothing read through the membership becomes part of your library. The membership's own terms put it plainly: if the membership ends, you no longer have access to the titles you selected from the programme.

When the membership ends, what it lent goes back. The help page describes a borrowing limit rather than ownership — up to 20 titles at a time, with no due dates — and the terms state that access to the titles you selected ends with the membership.

Buying is the other side of that line. It is the only route of the two that keeps what you finish, which makes it the one to weigh if keeping is part of why you read at all.

The two are not alternatives to each other. Buying the titles you want to keep is compatible with holding the membership rather than a substitute for it, which matters here because the membership itself gives you nothing to keep.

What the membership sells is continuing access to a catalogue rather than a set number of titles, so it is built to be used across months rather than in one sitting.

The reading it is built around is series reading, in the page's own words: 'Binge your favorite series'. That is a shape that carries on from one title into the next rather than stopping at one.

Buying has no period to it. Each title is taken on its own as you come to it, where the membership holds the whole catalogue open for as long as it runs.

What the membership covers is four named things, and those four are the whole of its benefit list: unlimited reading, audiobooks, magazine subscriptions, and a selection of Great on Kindle titles picked for how they display as ebooks.

This page states no amount for either route, and none was read from any page to write it. What the membership costs is stated on the official sign-up surface and can change, so it is not recorded here.

There is no break-even on this page. Working one out would need an amount for the membership and an amount for each title you would otherwise buy, and neither is stated here. What this page sets side by side is two shapes, not two sums.

The membership is not sized on this page either. Amazon states two different sizes for its catalogue on the same page — one in the membership's own benefit list, a smaller one in the store's membership menu — and this page repeats neither. They are Amazon's own figures and they do not agree.

Whether the particular titles you want are covered is not something this page can answer. It holds no title-level data, asks you for none, and does not guess — and neither does the tool it points at.