I don't know about Hayford, but many others have. Unfortunately they aren't/weren't "popular" enough so their comments don't get much play. I've personally heard leaders in the Assemblies of God and Church of God (TN) denominations denounce the lunacy in televangelism that's masked as Pentecostal Christianity.
What I find ironic about the "prosperity gospel" movement is that Pentecostalism in the U.S. actually began among the poor and lower-middle class - folks who didn't have these notions that God would make them rich.
Thanks.
Used to be an assumption that Pentecostalism was only a religion of the poor, low IQ, and uneducated etc.
My dissertation research literature review documented research which proved that was quite untrue on all counts.