AWS VPN server cost [on hold]

AWS VPN server cost [on hold]

This question is probably naive - please bear with me, I'm still getting
my head around how VPNs work.
TL;DR - if I host a VPN server on an EC2 instance (standalone, not VPC),
will I pay $.05/hr for every device connected to it?
We are considering hosting our VPN server on an AWS EC2 instance. There
will likely be hundreds of connected clients, but very little data
transfer. I'm concerned because of the pricing information in AWS' VPC
overview with regards to VPN connections
(http://aws.amazon.com/vpc/#pricing). It reads "$0.05 per VPN
Connection-hour"
However AWS' suggested use case is establishing a VPN connection to a VPC
so that it may be used as an extension of onsite IT infrastructure, which
I don't think applies in our situation (described below). Subsequently I'm
wondering if that .05/connection/hour pricing model applies. Also our VPN
server will not (or at least does not need to be) in a VPC -- a standalone
EC2 instance will be more than enough.
Our use case, in the event that it's helpful: We need to maintain a VPN
connection with (MikroTik) routers installed at a number of separate
physical locations to periodically push configuration updates.