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I can offer no evidence, but speaking as a reader, it would make me more likely to purchase a book if I had read and enjoyed the writer's freebies. Because I've already seen the writer's skill, ...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/1929 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/1929 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
I can offer no evidence, but speaking as a reader, it would make me more likely to purchase a book if I had read and enjoyed the writer's freebies. 1. Because I've already seen the writer's skill, style, and characters, and decided whether the writer was appealing to me 2. After a coupla freebies I start to feel like I owe the person something, and should support the generous writer with some money 3. Particularly if the writer is posting freebies in some interactive manner, so I could feel like I was part of a community, and thereby got a little invested in "seeing my cyber-friend's work do well."