I said legend, as I know for sure that it can be attained by playing coin rooms only. I haven't heard of anyone getting a higher tier,.
As far as a high avg, when I was promoted to tour champ, a friend also was promoted. We had a bet, so on our first round as a TC, we each shot the 10 stroke max, giving us an avg of 180.00 the bet was who could get back down to a 54 avg first.
Therefore our avg was very tainted. Go into a coin room with a 180 avg, people would go nuts. 180 was established due to it being our first round after promotion, as per wgt rules.