anarres
anarchist revolutionary
What version are you paying? Very early versions had a bug where you could get them to give as much gpt as you wanted, whether they could afford it or not. That at least could explain it.
If they won't pay 100 gold for a tech they don't think it's worth that much, plain and simple. This could be valid if you are trying to sell a dead-end tech after the wonder that the tech allows has been built, or if they have completed 98% of the research, and you are helping them get it the turn before completion. If this is the case (which it should be), then the only way they could offer lots of GPT is though a bug.
If they won't pay 100 gold for a tech they don't think it's worth that much, plain and simple. This could be valid if you are trying to sell a dead-end tech after the wonder that the tech allows has been built, or if they have completed 98% of the research, and you are helping them get it the turn before completion. If this is the case (which it should be), then the only way they could offer lots of GPT is though a bug.