But not too often.  Were you sick of being pummeled by year-end fundraising appeals, even if from your favorite charity?  Join the club.  But there is a method to that madness.  Asking for contributions must be done with a plan, and started by acknowledging what the donor has already done—that means stewardship and saying thank you before asking again:  http://janetlevineconsulting.com/how-much-is-too-much/