JScott
Flush
I think you could make a list like this, it would still have some subjectivity, but cost/availability would kill a lot of arguments.It's too subjective to ever make a list that has any merit.
I mean certainly no one would argue that RPC's aren't on a different level than Jacks, or that Jacks aren't on a different level than China clays... So you could make a better list than this (because this is just terrible), it just would never be perfect I agree.