Show me the money - (was Subjects as Literals)

I am still not hearing any argument to justify the costs of literals as 
subjects

I have loads and loads of code, both open source and commercial that 
assumes throughout that a node in a subject position is not a literal, 
and a node in a predicate position is a URI node.

Of course, the "correct" thing to do is to allow all three node types in 
all three positions. (Well four if we take the graph name as well!)

But if we make a change,  all of my code base will need to be checked 
for this issue.
This costs my company maybe $100K (very roughly)
No one has even showed me $1K of advantage for this change.

It is a no brainer not to do the fix even if it is technically correct

Jeremy