There are, cassa; however the net has liberated the market in the sense of making it easier to get access.
Traditional paper is not easy to break into, unless you have an inside contact. I do but even then..... the issue being royalties and you are lucky to even see 5% of sales as your take.
The internet is, of course, developing so you aren't going to get massive volume but then that it is countered by it being a global offering, allowing for language.
There are specialist publishers out there and the thing to do is to do some research based on the genre that your friends are writing about. They can help in placement and also guidance as to proofing and polishing your text. My editor is an ex Beeb screenwriter and brilliant in his advice and encouragement, particularly in getting me to write more emotionally about my characters and, hence, the personalisation and embedding of the personalities into the readers' minds, letting their imagination take over, just as we do with a aoer book or a radio play, or something like the Archers. They will also do all the necessary spade work for placement onto Kindle and other outlets like Lulu or specialist retailers if you are into poetry, sex themes, romance, whatever.
Working with exclusivity gives a better chance for building the relationship and the royalty takes are higher, 35 to 45% usually, and that's for an unknown writer. Non-exclusivity drops this to 15 to 25%. Copyright should remain with you......
Now don't expect a fortune.....I make a couple of hundred a month from my writing, some months higher....but it pays the booze bill (actually my travel bills) but it is growing each quarter. I am probably one of the more "successful" ones - the ultimate perhaps, even though her writing is crap, is "50 Shades of Grey," in that becoming an internet hit that then went paper-viral, E.L.James was able to command a higher royalty fee from her publishers than would be the normal for a debut-writer but, even then, she is probably lucky to make 15% of the cover price.
Hope this helps