Gentrification is a vicious, if potentially economically beneficial cycle that spares no one, not even those who create Earth's most delicious substance. So was the lesson learned by one nearly-century old chocolate factory, which was pushed out of its home on Christopher Street about a decade ago and found new digs in Sunset Park. But the tables have turned, and apparently neighbors are worried the new factory is making their area more attractive to the Whole-Foods-and-Bugaboo set. Will it never end?