[TowerTalk] 14' Extra Worth It for 80m Dipole?

[Edward Sylvester]

I have multiple antennas on a Hygain 70' Crank up Tower and a 10' Mast.  The 80m Rotary Dipole sits on top at 76'.  Have this yearning to raise the the 80m r. dipole so that it sits at 90' with the tower fully extended.  The net gain in height would be 14'.
 
Is this effort worth it?  Will I gain much?  Is this just plain crazy?
 
Thanks for your input.
 
73,
Ed NI6S