yup!
agree..it all depends in Luck..tried upgrading my lytning necky in the morning..
i wasted 1000 gems..(with rituals, and continous upgrading)then i stoped and let it for only +8..
then when i logged in at night, tried upgrading it..
one No Change.
then next, +9 na..
i only used 2 gems during my second trial. hahaha! sweet!