Ink for my Canon Pixma is only $15 for the official ink. There are 6 different inks, but each lasts longer than my mother's HP cartridges and I print more than she does.
On the other hand, HP's model is like the razor model: give away the printers cheap and charge an arm and a leg for the ink. Mind you, the printers are cheap pieces of excrement.
I'm guessing you never studied the scientific method. One point of data (anecdotal evidence) means nothing, even in a "soft science" like psychology.
The linked story says that both conditions can linked to "the same chromosomal neighborhoods", which is nowhere near the same thing as equating the two conditions (which the summary incorrectly implies). For my counter-point, my mother had bi-polar disorder. She never had any symptoms of schizophrenia or paranoia (and yes, I understand what those symptoms are), but looking back over my childhood, the manic and depressed periods are easy to recognize.
Always draw your curves, then plot your reading.