Krayt would know that the order of the Lolth's preferred sacrifices went form lowest to highest following order; any intelligent humanoid slave, elves and then drows. As Lolth as sadist goddess loved nothing more than torment of her own children. But second best is elves indeed.<br/><br/>Krayt could get favors that way or two, but that's entirely by whim and more better results he would get by selling slaves to church of Lolth. However actual kidnapping elves is risky business, as it means he first has to face adventuring band or somehow isolate the said elf from others and capture it alive.<br/><br/>Second house Tomtor guards this district; as if they would not at least provide protection from random violence the trade to city would die out and result a slow descend to ruin and drop in wealth over time if there would be no safety measures ensure that foreign quarter is free protected zone. The elves would had been needed walk through city gate guards and so if they are in, it means they are ironically protected from all drow related violence so long they do not provoke it nor go outside the ghetto or break local few laws which apply here.