People will be nice to you only till they need you or you are of any use to them.
This is a bitter but true saying. I too feel the same. But this doesn't go for your family members and your genuine friends. They are by your side all the time and are your true well wishers. So I like to live my life keeping them in mind :)
Yes, there are still good people on this Planet, we should never generalize
Money can be the biggest evil, it turns family members against each other, it creates distances between friends, and yes all of this depends on how much importance you give to it. But I too believe that goodness prevails, we really cannot judge why a person behaves in a particular manner, may be some of their weak areas of life, which they have to learn and grow from.
It is interesting what you say....I consider money the greatest tool to test people. I am grateful for money as it is almost always the best test tool for character