Love Don't Cost a Thing

Your question might be better expressed as,

How could/might we interprete the meaning of the above movie title of 2003?, Fansy, as there could be multiple interpretations.

Thank you very much for reminding me of my grammar.
"Love Don't Cost a Thing" is the title of a film, starring Nick Cannon, Christina Milian and Steve Harvey.

I suspect that we are intended to interpret the title as meaning that we can love someone without being obliged to make any sacrifice, monetary or otherwise, in doing so.