I did a little speculation below:
Is the Bonus or Royalty more important ??? Both???
The density of well drilling in the Marcellus appears to be about 1 well for each 40 acres of productive area.
http://www.binghamtonsustainability.org/files/gas/What%20Is%20Diffe...
Although a 20% royalty appears to be optimal and hardly unusual, assume a 15% royalty for making a rough estimate of the first year’s royalty income.
It is likely that the first day production might be 4000 mcf and the first years production might be an average of 3000 mcf/day.
3000 x 365 = 1,095,000 mcf/year x say, $5 = $5,475,000 x 15% = $821,250
First year income for each 40 acres might be $821,250 / 40
= $20,531.25/acre, MORE OR LESS [First year]
It does not matter where the well is located. What counts is how may acres are included in a given pool.
Note all of the numbers above are estimates. For example the $5 wellhead price used has been used by producers but current price is a little over $4 and there are pedictions of $7 or $8 in the near future. The spike of over $16 we had not long ago does not seem likely to return soon. [But then there is the enormous demand for energy in Indisa and China...]