domain Help me in Appraising these domains please converthtmltopdf dot com

[LifeRacer]

I have quite recently started looking into buying domains and below are the two domain names that i had bought:
converthtmltopdf dot com & rationalfiction dot com
how good are these domains? Estibot estimation shows around 4000 dollars for converthtmltopdf.com what is the real value of these domains?

 

[LifeRacer]

Can somebody please help me in estimating these domains?