haha! those are good questions!
a) in the 8th grade i got my last "oh my god, what did you do to my hair!!" haircut and it was about shoulder length. i decided "screw this" and have been keeping it long ever since.
b) I keep it pretty much this length. i don't like sitting on it so once it gets below my butt, i cut off 5-6 inches and let it grow again.
c) since i don't think i look good AT ALL with short hair, i don't plan on getting it cut. it's sorta my security blanket too. Plus, it's the one thing people compliment me on. as for donating it, there is SO much going around about how many of the hair donation charities are not what they claim (like Locks of Love) and so much of the hair gets thrown out or used by wigmakers to sell to the general public. I'm not sacrificing my hair so some rich lady can have it for extensions!
c) shampoo and conditioner that i use is Back to Basics sold at Ulta or Beauty brand stores. I get the vanilla plum variety and it smells SO GOOD!