Concerning bilingual books, I'm not sure many people buy them because they are only interested by the English text and don't care about the Irish part. There are loads of English-only books to read... I think bilingual books mostly interest people who are learning Irish and who want to have a book in Irish with the English translation to help them on the other page, so that they don't need to check every new word in a dictionary...

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Is fearr Gaeilg na Gaeltaċta ná Gaeilg ar biṫ eile
Agus is í Gaeilg Ġaoṫ Doḃair is binne

In fairness, I'd say that is true most of the time.

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Yes, you're right. Certainly for bilingual books that is more the case. But when the English translation is published separately, it is usually designed for people who aren't interested in the language of the original. Still, with bilingual books, there is a problem of being too literal and not getting the nuance across.

A better approach would be to provide a less literal translation opposite the original and a glossary in the back for the vocabulary. Even just the original language with a glossary or notes to refer to when stuck is often quite good.

I have a Cló Mercier edition of Sémaus Ó Grianna's Cith is Dealán that is like that, with a glossary at the back of dialect terms not normally found in a dictionary.

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Múinteoir Gaeilge - Irish Teacher
My "specialty" is Connemara Irish, particularly Cois Fhairrge dialect, but I can also speak Ulster and Munster Irish with native-level pronunciation.
Is fearr Gaeilge ḃriste ná Béarla cliste, cinnte, aċ i ḃfad níos fearr aríst í Gaeilge ḃinn ḃeo na nGaeltaċtaí.
Gaeilge Chonnacht (GC), go háraid Gaeilge Chois Fhairrge (GCF), Gaeilic Uladh (GU), Gaelainn na Mumhan (GM), agus Gaeilge an Chaighdeáin Oifigiúil (CO).