I'd say more people here have dual-channel than triple.
It's a decent idea I guess, but most 6GB kits are close in price to $150 (US). You could make an article for "The Best 6GB Triple Channel Memory Kit" or something and ask manufacturers to send in what they think to be the best 6GB kit that they make, regardless of price tag. Although it wouldn't be used much for real builds, it's something I wouldn't mind knowing. Maybe have an article for both