i can vouch for the fact that it has nothing to do with one's proficiency. i was 'promoted' to 'expert' today (1000 posts) and, although i have used biab for 6-7 years, i do not consider myself 'proficient' but i do offer help when i can as i'm sure you do as well. this is such a great group that i feel a debt to contribute back to the synergy of the whole.