The people who called it the golden door, usually hadn't experienced the harsh reality of the island. They were usually people who wanted to go to America, but could not afford it, or didn't have the right circumstances. The people that called it the isle of tears had either been there or heard the stories of what it was really like. Ellis Island was full of sadness, hunger, and fear. I think the isle of tears is a better description because the immigrants on the island did cry, in fact, they cried often. The golden door to America is not a realistic version of the island. The island was a door to America, but not a golden one. Therefore the isle of tears is a more fitting name.
A reduction in the price of the gasoline may lead to an increase in the demand since people would be able to afford it, taking into account that the rest of the variables remain the same.