My first lost wax casting attempt
Will be using a vacuum caster

Is having too many sprues bad?
Other than finishing purposes is there any reason not to attach as many sprues as I can?
The wax model is both halves of a zippo case lighter, and the walls are quite thin.

Also, if my wax model weighs 9.02 grams - without any sprues or base.
Will I really need 105+ grams of 10k gold for casting it?
I've got about 60g right now.

What is the best method for buying this extra gold?
Pure gold and melt it into 10k or maybe pawn shops or something?

Sorry for all the questions but any help would be greatly appreciated!!