Don't hire anyone - no matter what they offer - who promises you they'll sell 'X' copies of your book. Every book is different. The best any marketing company or PR firm can do for your book is make potential readers aware of it.
Sentiment: POSITIVE
Whether you work with a small or corporate press, the important thing is to have realistic expectations in terms of sales, promotion, and the work you have to do as an author promoting your novel.
Most novels put out by small or corporate presses don't really sell that well - usually a thousand copies or so. Working with a small press, you have to be willing to book reading tours, plan events, make contacts with other small press authors, and find new ways of getting word about your new work out there.
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