Yes, possibly.Well the original scheme presumably has some administration costs too and some of that will be saved. More so when the deterrent works and the numbers reduce.
It's no wonder people start to follow some conspiracy theories. On this (folk entering our country illegally) you either have to conclude there's more to government 'strategy' than meets the eye (e.g. tinker but don't fix to create more social unrest) or you have to conclude they're incompetent at dealing with the issue.