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There are exceptions to the "no illustrations" trend. For example, Susanna Clarke's Jonathan Strange & Mr. Norrel is filled with black-and-white illustrations reminiscent of the wood engravings...
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Source: https://writers.stackexchange.com/a/47423 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/47423 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
There are exceptions to the "no illustrations" trend. For example, Susanna Clarke's _Jonathan Strange & Mr. Norrel_ is filled with black-and-white illustrations reminiscent of the wood engravings that would have accompanied 19th-century books. This is in line with the novel's general style, a tribute to 19th century literature. However, in general, you are right - illustrations are rare, particularly in paperbacks. The issue, as you've guessed, is the price. There's paying the artist; there's printing the illustrations - ink costs money, particularly if you want coloured illustrations; there's arranging the pages so the illustrations fit in. In order for a coloured illustration to go in a paperback, it needs to be on a separate page of different paper quality; if the illustration is black and white, it still means more paper. All of those elements add up to make the illustrated book more expensive to produce. If you provide the illustrations, you eliminate one element here, but not all. If a publisher is going to invest more money in an illustrated print, they need to know the investment will pay off. They need to know enough buyers would be willing to pay the extra cost to cover the publisher's expenses. With a new writer, that's unlikely to happen - a new writer is a risk as is, their books might not sell. Which is why you see illustrated editions of established writers, particularly of their best-known works. Examples are J.R.R. Tolkien's [_The Lord of the Rings_](https://www.tolkien.co.uk/products/the-lord-of-the-rings-illustrated-slipcased-edition-j-r-r-tolkien-alan-lee-9780007525546/) and Ursula Le Guin's [_Earthsea_](https://www.bookdepository.com/The-Books-of-Earthsea-Ursula-K-Le-Guin/9781481465588?redirected=true&utm_medium=Google&utm_campaign=Base2&utm_source=IL&utm_content=The-Books-of-Earthsea&selectCurrency=ILS&w=AFF9AU96QH65NGA80T5X&pdg=aud-346191234401:pla-309526196374:kwd-309526196374:cmp-1348818631:adg-50951271061:crv-263323334808:pid-9781481465588:dev-c&gclid=CjwKCAjwkenqBRBgEiwA-bZVtvHecTeDKbWkP4_TrxRUIUlj1MwW7ckun2UbFrCCAghYyQP9AWbP1BoCa5kQAvD_BwE). In both cases, the books in question have become a classic, so there's no risk for the publisher in printing hardbacks with coloured illustrations.