If that 1.3m figure is from the LB surveys, they measure as little as a single login, for a character, meeting its criteria within the survey period, which is acknowledged to be susceptible to bloat by free login campaigns. It's more that it's a high point/maximum during the survey period as opposed to anything that could be used as an active daily figure, which I'd strongly doubt is anything like 1.3m. There's some other sites (not talking about ones which actually record live player metrics) that claim to estimate the numbers for it but I doubt it's based on anything reliable.
Yeah I'd be interested to see how that'd go as well, including in terms of their accounts...