Use your noggin. People tend to purchase the same USD amount regardless of the price per mil. So they'll buy 50M at $1/M for $50 or 250M at $0.2M for $50. The difference is the margins. With the first instance, the gold site would buy the gold for say $0.8/M and sell for $1/M which is a gross profit margin of 20%. In the latter, the company would buy it at say $0.15/M and sell for $0.2/M which is a gross profit margin of 25%. This is, not using real numbers, the difference between RS3 and 07 currently. That means, purely on a gross profit margin basis, RS3 is a more profitable.
However, RS3 is also purchased far less frequently, so 07 is more profitable due to more orders. As established above, people's orders tend to be the same USD amount regardless of the price of the gold, so across servers the average order is about the same. Additionally, as 07 has fallen in price, the average order, excluding the initial opening couple weeks, has been roughly the same. This means as the demand remains constant, the average order USD amount remains constant, and the margin steadily gets wider, gold shops will make more profit as the price of gold drops. This has already been the case from when gold was around and just below $2/M until now. Do some research and check the average buy and sell price then and the average buy and sell price now. Higher margins, and actually increased demand due to increased advertising from firms and an expanding player base for 07.
