When you start a new business or improve an old one, you generally have to experiment with many things. Such as finding the proper way to collect leads, testing advertising platforms, selecting the right demographics & their interests, etc.
Any of these will need investing a huge money. And if anything goes wrong with your techniques, you'll lose the money, time & effort.
Luckily, you don't have to do these experiments. Because my previous clients & I already experimented with those strategies.