Such a price would be at least partially justified (IMO) if the new map would offer a noticable different setting, like the far east, mediterrean, etc. So yeah, Tanoa would've been cool, just anything different would be refreshing. (I'd still like to see a original non-easterm-european map for DayZ.)
I'd even pay for any new map to support the development, but a paid map (Arma 3 or not) feels to me like it's slightly separating the player base.