Many prefer simple language, but sometimes you need to use some less common words. Many folks here are students and are fluent with uncommon words as they have learnt all those skills through experience... some go through TOEFL, GMAT, SAT etc. Others are scientists, mathematicians, engineers, physicians, surgeons. Many words used by professionals are very uncommon to laymen, and some words carry specific meaning pertaining to some subjects. It sometimes so happens you could write one word or two to describe what would otherwise take a paragraph or a page. Also, although I've come across very tough vocabulary in this forum, I just could ignore them without losing anything. In this case, I could always reread to find the actual meaning of the words. Also this forum provides a handy internet dictionary you just need to click the word twice to find out its meaning. In the end I actually have found a new word and/or new meaning. I personally would either ignore the words or learn them, try them and use them in my new postings. It is always good to learn, and it is not less so to learn to use new words in an appropriate context. You'd be surprised what benefit it could bring you when you could show off your vocabulary to others efficiently and knowlingly