Hm... maybe you`re right. Or it could be just because of looks. I don`t know.. Or maybe because of her personal opinion or something?

to add some degree of emotions to the title?

Exactly. Caps give emotions more emotions to a song. I'm fine with it, coz it makes the titles somewhat special. I've seen so far it's only J-Pop that used that kind of capitalization. Perhaps K-Pop, but I'm unsure.

Thankfully she hasn't yet to used　☆, ★, ♪, ♭, ♯, +, - and so on,,,,,

i just love caps..haha...maybe you say about STEPyou..its pretty cool though

Maybe her spelling is just getting worst and worst!~ xDDD Nah, I think it's just to make the titles look cooler. :yes

Yeah, I think it's just for extra dramatic titles. I think that Ayu likes to put feeling behind everything, including the way the title is said because in Japansese you say different parts of a word higher/louder then other parts.