Why is Siddha less common in Western world?

The reason is due to the following facts. 

• The majority of the Siddha literature is still in Tamil. 
• When Western scholars like Max Müller were endowed with translated versions of Sanskrit literature, including Ayurveda, no such effort seems to have been made to introduce Tamil works to western scholars. 
• Thousands of Siddha literature still remain in the form of palm leaf manuscripts.