50 is just a term for dank, like in some places they call it 'fifty hundred', it doesn't necessarily mean the price, but the quality. I'm assuming you live in the south, because thats the only places I've heard them call 'dank'. also, anything considered dank is usually called 'dro' or 'hydro' even if it was soil grown, and there are alot more different names people say when they refer to dank, and varies from place to place (GOOD FUCKING BUD). again, it is more of a description of quality than a strain name or price.