I have been trying to understand why there are not that many audiobooks in Spanish. If you go to www.audible.com you will find very poor collection of Spanish audiobooks. Even most of the bestsellers are not produced in Spanish.
Create an www.audible.com for Latin America (in Spanish and Portuguese). Keep in mind that this probably means having a recording studio to create quality Spanish audiobooks of the bestsellers.
"Audiobooks are the fastest growing segment in publishing and everyone within the industry is very bullish about the future of the format. There are a number of new start-ups that are making waves and retailers are beginning to release that audiobooks are worth investing in. The global audiobook industry is currently evaluated at 2.8 billion dollars and this is primarily due to the sheer amount of new titles that were produced in 2015. 43,000 new audiobooks were released this year, which is a slight increase from the 36,000 that came out in 2014 and a far cry from the 20,000 that were issued in 2013." by Michael Kozlowski