Okay, these are a little rough as I didn't go back over my old tax books for the exact amounts but here goes:
For Inish Carraig
I paid around £600 for editing. Part of this was editorial before it went to an agent who then extensively worked on it, part of this was copy editing, for which
@TheDustyZebra needs to charge me more for next time, part of it was an editorial review pre publication. I was lucky that a substantive amount of editing was done by the agent, but her version was not the version released so there was some additional work getting it put back to how I wanted the book. Overall I think this is good value for money and I would not release a novel without paying for substantive editing.
Promos - these are mostly Bookbub (the king of them all), Bookbarbarian (always turns a small profit for me and always easy to deal with), Bookends, and a few others. Around £300 over the lifetime of 3 and a half years. When sales are lower than projected, it's always worth telling the company that - many will offer a second promo or even money back.
Cover - Gary Compton kindly produced the cover free for me, so I had no costs.
So, all in around £900.
I didn't pay for a proof, but ordered copies instead. This was risky but I was assured the internal files were correct, which they were.
I haven't - and don't ever plan to - pay for reviews. I'm lucky in that I have cover and blurb content in place. In fact, I used
@Brian G Turner 's very excellent review on the paperback cover.
Sales - paperback sales are around 200. This is accounted for by it being locally popular and lots of people getting signed copies over the years, as well as sales at conventions etc where I can offer a slightly lower price. Ebook sales sit in the low 4 figures. I've also given around 700 away free as promo.
Overall, then, I spent around £900 putting it out and I've taken in a good four-figure profit (based on £2 per book as an average - some will have sold for 99p but some for significantly higher) but it did take me at least 18 months to break even. It still ticks along steadily and when I do ever get the sequel out, I'd expect another little gain in sales.
By contrast, I paid £300 for the return of the Abendau rights to me and the configuring of new covers and so far I've recouped just over a third of that cost. I'm happy it should come back to me with time, and I have had no other costs for producing those books as the publisher paid for editorial and covers, but the bulk of sales were with Tickety boo prior to me purchasing the rights back. But, as I intend to write more in that world, I'm just happy to have the ownership with me.
I think it's worth hanging in there,
@Guillermo Stitch - the longer a book ticks along, the more reviews it gets and then promos etc work better.