Simon, if you click on the Paypal link, and then on the 2Checkout one on the next screen, you'll find a list of suggested amounts ranging from $10 to $1,000.
I imagine that contribution levels will vary widely by individual and think it unlikely that the total will come near to compensating Alex for out-of-pocket expenses, far less time, so I don't think it's possible to give you a formula.
It might be helpful to look at it this way: "If I had to pay a fee to participate, above what price-point would I decline?" The answer to that question will reflect both a member's personal financial circumstances and the Board's value to them.
John
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