Oh sure, I know about PT Barnum. I've heard so many lies here from atheists and not so much from the religious.
Since you brought it up, does God give a sucker an even break. The answer is no.
I'm a model for the prosperity Gospel and very happy with my life. If I died tomorrow, my life would still have meaning and I would have left a mark. I think Joel Osteen's video's and messages have helped in those moments where I questioned my own religion.
It's really all about the money as Joel's and others lavish, immaculate, and excessive lifestyle attest. But he does seem to sell a popular product making people want to buy it.
I'm betting those people wouldn't give you the time of day out in the street, and rest assured they wouldn't give a damn about your personal welfare. Many live in expansive mansions with private armed security patrolling the grounds like Joyce Meyer and Kenneth Copeland.
They obviously sell en masse their "help" programs of which is designed entirely for mass audiences in mind to maximize the amount of revenue they can possibly get through their online stores, church stores, and conventions.
As for the programs themselves? It's an odds game for which the effectiveness itself is statistically hit and miss, sometimes no benefit, sometimes benefit, factored in and formulated, and thus propagates it's "validity" that such things are on par with its target audience and pitched that it potentially helps everyone who buys in. I'm glad for your personal successes, but I suspect it's more through circumstances and conditions than what Joel or anyone else provides that is put up for sale.
Joel is a prosperous businessman selling Christianity, and is doing exceedingly well for himself.
People like buying into the magic pill so who am I to say just what they can and cannot spend their "love seeds" on?
For what it's worth though, just about any and every single religion does pretty much the same things. It's human nature.