Disagree (strongly) with the idea of hunting for an un-related node (by the monk you wish to ++):

Among other objections:

1. skews the value of node reputations
2. depending on your level of expertise, risks uprating a node with some significant defect
3. perhaps reflects confusion about the role and significance of XP

Better, IMO, YMMV, an acknowledgment/thank you in the CB (and yes, see re karma, above)
  ... and, better still, repay your debt by passing on the wisdom you receive.