To repeat myself, there is no holy grail. No subscription service or advisor will deliver you results 100% of the time, no matter how much money you have to throw at such things.
Anyone claiming they've "got the grail if you've got enough money" is to be taken with a very large pinch of salt indeed.
How does the Holy Grail come into this? Your characterization of what investment managers do is as much an idealization as you allege mine is. Many investment groups are 5-20 person shops with middle of the road skill sets who are looking to add value to their process. No imputation that by adding predictive services that they will have found the Grail. I'm sure they'd be happy with services that might promise them a 25-50 basis pick-up in return for a product or two.