Currently:
N/A

Desired:
The ability to charge dynamic membership dues. Currently you can do this by creating extra cost fields and assign different costs to different choices, but some organizations might have very complex formulas. For example:

An organization might charge their corporate members per employer per year x $16.50 per head. However, they may have a minimum annual dues of 40 employees x 16.50, and a maximum annual dues of 400 x 16.50. There also may be an annual facility fee for each corporate member $100 per facility with a minimum of one facility and a maximum of five.

This may seem like an elaborate formula, but it is based on one from one of our clients.

We'd like to get some feedback on this from you. Is the ability to create a dynamic membership fee based on a number of different factors something that your organization needs or requires?

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Giuliano Valentino, Useful Apricot

I currently have a client with a similar issue here.

Their members are various organizations whose membership dues are calculated based on a formula related to the amount of grant money the organization contributed in the previous calendar year.  The formula would be "total grants x .0029" so each member would effectively pay a different fee.

I'd love to see the ability to base a membership fee based on a formula like this.  As a fallback, it'd even been great to create a membership level with a "to be determined" blank value that could be set manually for each member.

I'm going to change the title of this post because I think there might be a better way to think about this.

What is there were a special type of field that you could put on application forms - a CALCULATED field - which would work similar to an extra cost field?

When applying, the applicant would enter a number  to a field that you have either assigned a (a) percentage (like in JayBuys case above, or for tithing) or (b) a multiple (pay $10 for each employee in your organization).

You could make your membership level "free" then and have all your membership fees determined by the values they've entered.

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Giuliano Valentino, Useful Apricot