Why are classical composers so averse to writing music for electric instruments?

I've noticed that there is very little classical music written for electric instruments (electric guitar, bass, violin, cello, etc.). I am aware that there were a few composers during the 50s who fiddled around with the electric guitar, that there were a few minimalist composers who wrote for the electric guitar and violin, and that there are a handful of popular composers who crossed over into classical and composed music for electric instruments. However, other than this handful of exceptions, it doesn't seem like electric instruments ever caught on much in the classical world. But why is this exactly? Is it a matter of tradition, that composers are loath to break away from acoustic instruments? Is it that electric instruments have such a strong affiliation with popular music that classical composers feel that it would be beneath them to compose for them? Or have electric instruments actually scene an increase in popularity in recent years and I'm just outdated? Any insight into this question you can give me would be greatly appreciated.