Please no low level responses. 
I am currently level 65, with my fire mastery at lvl 61, ice lvl 50, spear lvl 52, lightning lvl 48.
This is what I am thinking about doing.
Killing ice to level 0. Making spear lvl 60 with lvl 6 passive. Lightning lvl 60 with nuke as much as possible. Depending on how much SP I have left I will up my fire as much as I can and then at lvl 70 I will lower fire to level 61 and start to SP farm.
It's only 28 silk to kill 5 things. So let me calculate how many I need real quick then I will edit this post! 
Ok so it will only take me 85 of those things so thats 28 x 9 for the amount of silk I need xD
or in other words, 252 silk....
That is 12,208 skill points.
To max out my lightning and fire both upto lvl 70 I need 102,287.
That means I need to farm 90,079 SP at levle 70.....I think I just answered all of my own questions....