。
There are varying degrees of poverty.
Literal
Poverty [in-に] [even-も] from-best to-worst exists.
ピンからキリまで is a set expression meaning 'from top to bottom, running the gamut.' ピン and キリ derive from Portuguese card-game terminology — one of the oldest layers of loanwords in Japanese. The にも means 'even in/regarding poverty,' implying that even within this category, there are gradations.