1. It was designed to be a teaching language
2. Everything included. You get a great simple IDE and a ton of packages
3. Great teaching materials (I learned the most from HTDP than any other programming book and I have read a ton)
a) How to Design Programs http://www.ccs.neu.edu/home/matthias/HtDP2e/
b) http://realmofracket.com/ . Great book I learned a ton and especially when I went through the book with my 11 year old daughter
4. The great minds of Lisp are at Racket (Ever read Little Schemer?)
5. Racket keeps getting better and better with great modern ideas. It might have been born from Academia it has awesome real world legs. Just look how easy it is to deploy your program after you are done.
6. Best documentation system of any language. The documentation is code and it makes for great documents. http://docs.racket-lang.org/