it does matter to me, because i´m often travelling by train, with only my netbook (10,1") keeping my company. in case you dont want to ruin your eyes, reading kanjis is quite difficult on such a small display.
thats my personal reason no1, but apart from me its always cool seeing good work beeing brought to a wider audience. another reason is that recommending games to my friends/acquaintances would also become much easier, as not everyone of them has the time or dedication to learn japanese, but are showing great interest in the medium itself. last reason would be, that it might improve the outward appearance of visual novels in the public, got those cold stares thrown at me bit too often in my life.
edit: on my list are also lots of vn´s, which i didnt complete 100%, beacause of reasons, like when heroine x annoyed me as fuck.
read most of them during my 3years working on a ship, without television & stuff.
downloaded as much as i could find & always read them when the other ones were too loud for me to sleep (4man cabin)