A collector would be someone very wealthy, collecting for love or money or both. It is sometimes someone who purchases on impulse. Collectors buy art because they enjoy beauty as a part of their life style. Sometimes collectors buy art to fill a void in their life.
What makes a great art collector? Having an unlimited amount of money helps but it is not essential. Some collectors treat it as a hobby: an intellectual and emotional joy which served the additional purpose of decorating one's private home. Since the end of WWII there is a different type of collector. They pursue their own passions however with an awareness that the whole world is watching. Their collections are a matter of public record and their prized possessions are on loan to other museums and companies for the entire world to see.
There are as many types of collectors as there are collections. To the avid collector, knowledge about art is far more important than money. Collecting art desires desires, passions and emotions. It speaks of addictions, obsessions and instincts. A collector can be someone who does not have huge resources of money. It could be someone who has a minimum wage income, and goes to local thrift stores looking for baby bottles to add to his bottle and glass collection.
A collector is also someone who has the courage to buy the work of an artist early in their career; when the artist is still virtually unknown. Anyone can buy the work of a known artist if they have the money. Some collectors are in love with their collections and say good night and good morning to their favorite painting. This is probably a little sentimental and extreme; however it is this passion that creates a great collector. Collectors treat their collections and take the same measures as a museum would do to protect its art. In some cases ceramics and marble statues are bolted down to protect against earthquakes. Certain collectors have high standards when buying a work of art. A work has to be museum quality.
The artist and the collector create a partnership or sometimes a whole; two people coming together to create one organism almost like a marriage.