variable costs for events and membership as a price multiplied by a number 
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?
UPDATE: Released in v5.3
Released in 5.3
Heather Huckeba commented
We would use this feature as well. We wanted to offer event attendees the chance to pre-pay for meal tickets as well as to pre-pay for t-shirts, but it seemed like it would have been awkward with the current set up. We decided to wait on adding that until a future event, but if the event registration was reformatted, we would definitely use this.
We would want people to add as many meal tickets as they want at $x per ticket, and as many t-shirts at $x price per shirt.
Thanks for considering this.
Dmitry Buterin commented
Jay, thanks for posting.
I would appreciate input from other users with a similar need.
Jay Harrell commented
Iam trying to set up an event registration form for our site. I want itto look and function something like this one on our old site: http://www.atlantayachtclub.org/AYCpages/AYC-regattas/AYCopenregatta-reg.html
I can't figure out a good way to do the"how many dinners do you want?" fields. Basically, I need a Dropdownlist with extra costs for each item. Right now if I use a DropDown, thecost is not added to the registration cost. I have tried checkboxes andradio buttons as extra cost items, but these both look bad andare hard to understand for the users.
A single-selection Dropdown list would be configured the same way that an Extra Cost Radio Button group is configured, but would be displayed as a Dropdown selection. We would find this very helpful in setting up our events.
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.
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.
OK, great, we will add it to our to-do list
WildApricot User commented
In our association, members can invite guests to luncheons, banquets, etc. Currently, I am using a registration field that adds additional fees based on how many guests the person is bringing. (I have to use radio buttons:1 guest @ $352 guests @ $703 guests @ $105etc.)It would great if in a future upgrade, that guest fees could be calculated by putting a number in a field that multiplies it by the fee for that level (guest) and also add that number of guests as "Atttendees" in the list. Currently, only the person registering is counted.Just a wish for your wish list...Michael JohnsonPRAL Webmaster