There are many reasons why people buy oil lamps.
For some people it is purely practical. They need a non-electric light source that is cost effective, easy to use and gives plenty of light. Center draft lamps and Aladdin incandescent mantle lamps are ideal for those in this group.
Period home decorators
Other people are drawn to oil lamps through a desire to decorate their period home in an authentic manner. For these people, the aesthetic appeal is the principal focus. Banquet lamps, parlor lamps and table lamps are the most popular for this purpose.