I couldn't read the kanji in parentheses in Remilia's line, but I translated the rest of it.

the kanji in question is 閻魔(enma)

How can counting money be a hobby for Reimu?

Rekki said:
How can counting money be a hobby for Reimu?

She counts the amount of money she got from beating the crap out of the person she just mugged.

Or she's counting imaginary money.

She counts imaginary money to help her get to sleep. Y'know, like counting sheep.

I think Rekki meant "How can Reimu can't money" in the sense of an implicit "When she doesn't have any?".