Managers in the fundraising sector face the constant challenge of solliciting donations from a population who may or may not have donated before. Rather than merely asking respondents what they wish to donate, it is standard practice to present a set of suggested amounts -the appeals scale- in making donation requests. With a large scale field trial, coupled with a donation database from a French charity, we find with a segment-level Bayesian model, a very significant influence of the appeals scale and of 'round' scale values, such as those appearing on common bank notes, on distribution of donations.