We're talking about 338 members receiving perhaps 100 gifts per year at the most. Also, it's rare for any one member to receive many gifts. It's very rare, in fact.
Yes, we do look at where gifts come from. One of the reasons we release the source of gifts is that a journalist might become interested in a member who has received gifts from companies or individuals who are associated in some way. We release the giver's name because it forces the member to reveal the source of the gift and we can carry out an analysis. In practice, however, it's not really necessary to do that because very few members receive more than one gift.