One buy now, pay later outfit finding growth easy and profits impossible is Zip Money.Receivables soared 54 per cent over six months to A$489 million at December 2018."Transaction volume" of $496 million was up 110 per cent, thanks to more than one million customers using this credit card substitute at 12,600 retailers.So revenue of $34 million was up 112 per cent.The bottom line remains a loss: $6.8 million over the six months to December, around half the loss over the same period in 2017.Accumulated losses are now $64 million.Zip put "net bad debts" at 1.81 per cent, down from 2.61 per cent a year before.