![]() ![]() ![]() More specialised, serious books may require a conversion factor closer to 1/1,000, reflecting a greater proportion of their buyers being motivated to join a site dedicated to the cataloguing of personal libraries, while older mass-market books have been shown in some cases to require a conversion factor closer to between 1/5,000 and 1/10,000, but these are exceptional. Preliminary analysis in comparison to reported sales figures per book appears to suggest that there are roughly 3,000 copies of each work extant for every member copy listed at currently, but with considerable variation from this figure both upward and downward. ![]() These results can be checked at source, but are subject to future variations owing to members adding their books or deleting their accounts. I conducted a survey today to determine relative ownership rates of different astrology-related texts in English and establish a rough idea of the 500 or so most commonly found today, which will tend to have been bestsellers, although it is worth noting that older books may be under-represented in proportion to original sale rates as a result of cumulative outright losses and disposals compared with newer books, while those still on the market may be yet to make many more sales in the years to come. Survey of the 564 most owned astrology books in English, according to the sample of users at ![]()
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