We offer our authors a choice of royalties -- from 12 to 15 percent. Most choose the 12 percent option but many still take 15 percent.
Several of our technical titles have sold well over 20,000 copies but we've also had the rare title sell in the 2-3,000 copy range. That is definitely rare and only on very niche topics.
Writing a technical book is a lot of work on both ends, especially when a publisher provides real editorial and marketing support. Unfortunately, most no longer do, which is unfortunate for all