日語 Japanese Ask Questions Thread2 質問

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Japanese - Ask questions thread
http://dis.4chan.org/read/lang/1174719097/l50

when deciding to use kanji or hiragana, i thought it was chosen baised on target audience (eg write out the more obscure/ higher level words/kanji)

but more and more I seem to be comming across what seems to me like random use of hiragana.
eg: I got the game 燃えろ！熱血リズム魂　押忍！闘え！応援団２ and right off the bat I see
ひとりで応援
why would a extremely simple word be in hiragana and a more complex one be in kanji??