Hello Marcus,
Thank you for your question about the shipping costs. It looks like the shipping calculator got a bid behind with the high volume over the previous holiday. It should be corrected now for the past and future snipes.
Regarding your question about the bid groups, our intention was to correct the help page on that topic, but apparently we missed one. Unfortunately, it is impossible to have items in groups that close less than 15-20 seconds, because that is the amount of lead time we offer on the snipes. We did try to change it to mere seconds, but it caused too much confusion.
Based on your email, we set it to 30 seconds instead of two minutes. This will show up in the next release.
We try to be very responsive in terms of suggestions or feature requests, so please let us know if there is anything else we can do to improve your experience.
bidslammer