I think The Price has to do more with
how girls that make a contract have to give up their souls
rather than what was marked with * in the translation. He felt shallow because of the difference between
giving up your soul
and
giving up your existence
He wasn't willing to pay the smaller price in the first place, thinking it was too much to give.

At least, that's how I feel about it.

This sentence:

"ここまで観てきてそれでも良いとさえ思っていたけれど、魔法少女がなしてきたこと、願いを全肯定してあげながらも、その対価が覆るほど都合のいいものではないまどかの救済のあり方を理解するに至り"

which is translated as:

"I had watched it until then and I even thought despite all that, the situation was not bad. While giving my total approval of becoming magical girl and their fights, the price* is something that had overturned my conviction - it wasn't just some convenient excuses. Until I came to understand how Madoka's salvation is going to work"

should be something more like:

"I watched the show up until that particular point and had even thought that all was well, but then I came to the understanding that her becoming a magical girl, the gains of Madoka's redemption - while she did affirm all of their (all the magical girl's) wishes - were not so convenient that they outweighed the price that she paid."