Some guilds think it's great to have the most sent, I think the most received is a bigger deal. If everyone is actively requesting then you can all get numbers up. When you are trying to give the most there is a minor disincentive to request.
Also always have a laugh when see a guild with a minimum requirement of 100 heals. Come on that is easy and there is one in the current Top 10 (clearly not BM's equivalent) with that on their wall. I would be slightly embarrassed at that.