The conversation is in regards to just that though.
When it says "per caster level(max 50points)" in the spell description, in terms of Caster level, it is saying "Max CL10".
In the mythic version it makes no reference to a max amount/CL. It is upgrading the "max CL 10" to be caster level+1/2 mythic tier.
That is where the hang up on it is...