[We do not consider MtGox as "valid price source", as for me - none of the individual exchanges are. But as long as they are not faking their ticker figures and someone is still willing to trade there even considering fiat withdrawal problems - we should count it in as one of the market players.
Since MtGox volume is not decisive anymore even for USD market (not to mention global averages) - we don't see the need to exclude it. It exists and works, it is a part of the global landscape, whether we like it or not, and we have to include it.
Alex at BitcoinAverage.
Could I just check with you.... when computing Mt Gox's volume for a currency, do you make sure only to inlcude
primary transactions as returned by the Mt Gox API? If not, you will end up, the global average will end up double counting transactions that are cross-matched between, e.g. the EUR and USD orderbooks (which Mt. Gox.'s multi-currency ordermatching will do if it's still the best order on the orderbook, taking into account the Gox currency conversion fee).
roy