From the announcements ebay advises have nefotiated the $7.15 etc rates.  Anyone who sells more than 250 items per year can also apply for the same discount.  

As for charging fees on the total amount to ensure some sellers do not get away without paying any fees at all I think is quite acceptable, what I dont think is acceptable is to support this they did not compensate by lowering the total fees.  The extra revenue from catching all those transactions plus the additional 10% revenue collected on postage paid for every transaction must be a massive increase.  Not to not to redirect some of that back by reduced fees is just shocking.  Or now that ebay have the postage linked they know exactly how much postage is costing for items purchased on the site.  What is their justification for charging 10% on top of postage paid via these means?

Could the push to offering 'free postage' be their tactic to reduce the reported $'s collected for postage and in turn for fees collected on postage?  And also push that into listing amounts to boost up their $'s collected from listings?