Not really, ransomware is way more dangerous than selling viagra; I may want to kill you if you encrypt my data, not so much if you sell me a couple of viagra pills that don't work. When you scam someone (e.g nigerian scam) you take money from one (or a few) person only, here you are taking data from a lot of people and hoping some very few will pay; making a lot more enemies in the process, likely including state actors; which may make it a federal crime to pay such ransomwares.