When I have more than 1x Buy activated (e.g. 'x10'), the cost for exploration is also increased by that amount. (For instance, the 2nd Colony says "Cost 160 Winged Ants" when I have x10 activated.)
In case anyone's missed it, we've been posting previews, spoilers, and teasers for our next set on our blog: http://www.cardhunter.com/blog/ Some really cool stuff there, check it out!
I wanted everyone to know, you can vote on the current Aloyzo's Arsenal contest! YOU decide which items get added to the game! http://forums.cardhunter.com/threads/aloyzos-arsenal-13-community-choice-poll.10075/
Thanks, you've found a nasty bug! ;-)