Leslie,
No. 2 first: I cannot imagine any situation where the Development Office decides what is accepted into the museum's collections. If there is not a collections staff (and there should be at least one), then the Director and/or a board committee should make the decisions. Your Collections Policy should outline this.
No. 1: Off the top of my head, I can only think of 2 - 2 1/2 reasons to put individual values on objects. 1) if the donor wishes to take a tax deduction, they must have the item appraised by a certified appraiser. As a rule of thumb, this is only necessary if the item or group of items meet the $5,000 threshold. 2) if the museum carries the value of collections on its balance sheet (not recommended). And even in this case, museum staff can provide an estimated value through professional awareness -- unless an appraisal is provided. And really, many historical objects are very difficult to evaluate and the process for doing it for every piece takes a ridiculous amount of time. This estimate also covers the 1/2 reason for having a monetary values and that is for collections insurance.
I'll be interested to see any other responses however.
Good luck with the decision-making issue.
------------------------------
Betty Brewer, Museum Consultant
------------------------------