Typically its only state agencies that will fund an operation with uncertain pay off over long periods of time. That type of patience is expensive.
Online criminals are beholden to changing market pressures and short term investment pressures like any other start up.
That said it's a lot of work - 2 years at least. It's an exploit that's so good that you'd have to use incredibly carefully - also because if/when it's discovered it's going to break everywhere.
I've read descriptions about how the NSA (and presumably other such agencies) and they're really careful. The first job is to make sure the target doesn't get confirmation that they are in fact a target. The second is that they always cover their tracks so the target doesn't know they were a target.
Criminals tend to do the first but almost never the second so a tool like this - while I'm sure they would love - isn't worth the amount of work it would take to develop.
Again - I'm not 100% on this but ... 40% ? say 20% criminals, 10% lone wolf?