You could always check the CN forums on the usual amount of cash
being offered for resources trading. I believe they do have a
thread on that. Let me see if I can pull it out. 
And nope, nothing is pushing too hard when it come to resources.
The fact that somebody is willing to pump money to get/sustain a
trade, shows that he/she wants the trade very much. You can always
try to pump it up by 10-50K max..
