No matter the extension, this is a hot keyword.
However, there hasn't been any reported sales on Namebio in .insure extension.
I would be skeptical determining a price for this so I would go with estibot and valuate appraisal at around a $100 only.
However, I would price it atleast $500 should I be in your place and won't take a deal below that even if I end up not selling it at all.