Full Idea
It is rare to find any direct reason given for believing that the empty set exists, except for variants of Dedekind's argument from convenience.
Gist of Idea
Usually the only reason given for accepting the empty set is convenience
Source
Michael Potter (Set Theory and Its Philosophy [2004], 04.3)
Book Reference
Potter,Michael: 'Set Theory and Its Philosophy' [OUP 2004], p.59