We currently expect to pay approximately $75 to $100 USD per month with this volume of email.
With the new "MailChimp pricing", this will cost us $150 for a MailChimp account with enough subscribers, then between $270 and $400 USD per month in data packs.
So from about $75 to $100 USD we get forced up to $420-$550
About a 5x price rise.
Nice going MailChimp...
Clearly this is an attempt to squeeze more profit out of Mandrill. Was there a management change at MailChimp or something?