That’s true. Almost every book about Sanskrit I have read in English or in German is comparative with Latin and Greek. I don’t mind that, but there are people who want to study Sanskrit for practical reasons alone. To be able to read religious and nonreligious writings.
Learning Sanskrit is the easiest for people who already know an Indian language, e.g. Hindi, Tamil, Kannada. The vocabulary of these languages are largely made up by Sanskrit words. There are also good publications in Indian languages for Sanskrit students.
The internet is very helpful in learning Sanskrit. I mentioned some websites earlier in another topic:
http://discourse.textkit.com/t/sanskrit/3883/1
Samskrta-Subodhini by Professor Madhav Deshpande is the best textbook in English I can recommend.