I think that there should be new levels created for the forum at 1 and 5 btc, plus a very high level at say 250 for the people who really support this forum.
Really supporting this forum and ability to pay does not correlate. I really support this forum, but I cannot even dream to have enough btc to donate 250 to this forum.
Problem is, when people donated 10 or 100 btc, at that time the value of btc was 10X or 20X less than current value. I would happily donate 50 ltc to the forum, but cannot afford to donate 50 btc. If/when LTC goes to 100usd, some newbie would probably say the same thing for LTC.