after the update you're no longer able to have unlimited items in your inventory. I have around 1k old items and it will cost more than 10 million gold to use them as boost items. Not even that, i had 2 ultra energy kits that gives you 500k energy. When i use them to boost the new items they will give you around 5k and that's not fair ._.
beein able to exchange your old items into gold/tokens
common > 1000 gold
rare > 3000 gold
epic > 5000 gold
legendary > 10000 gold or 15 tokens
mytical ( weapons, modules, specials ) >35000 gold or 40 tokens
mythical (torsos and legs) 50000 gold or 60 tokens
that's atleast my idea how to get rid of your old items ( seriously epic items are as strong as old mythicals )
sorry for my bad english ._.