Part of the reason for that is legislatures have given them more options in that department. The money crimes that were created to give cops an oblique way to go after drug dealers apply to pretty much any crime, i.e. if you rob a bank it's likely they'll be able to charge with with money laundering, structuring, currency smuggling, wire fraud, or any of a dozen of those types of crime. Plus, conspiracy goes with just about everything.
Prosecutors don't have to take much to trial any more, since instead of charging you with just the crime people recognize (say, bank robbery or drug dealing), they can add up a bunch of lower level 3-5 crimes and have you looking at 300 years in jail unless you take the plea bargain. 98% of federal prosecutions never go to trial - we used to laugh at the commies for that sort of thing.
Prosecutors don't have to take much to trial any more, since instead of charging you with just the crime people recognize (say, bank robbery or drug dealing), they can add up a bunch of lower level 3-5 crimes and have you looking at 300 years in jail unless you take the plea bargain. 98% of federal prosecutions never go to trial - we used to laugh at the commies for that sort of thing.