Why would they need to justify the price, its already cheaper than buying the same bundle in sony branded goods so i fail to see an issue, hellsing no offence but you don't half post a lot a rubbish :P
E3 don't have to "justify" anything, they released a bundle that was already cheaper than the normal sony stuff yet you seem to think they need to justify the price, as of today the bundle works out at around £44 GBP
For reference the sony nav controller is £25 here and the motion controller is another £35, so even if you exclude the rest of the stuff you're already saving a large amount, there is no need to "justify" this price and they dont do anything like that, they are already cheaper than the official products by a hefty margin