While I do realize that it was a hit. Fredo, IMO, didn't think it was, although it's pretty olbvious, he admitted he didn't know and didnt' want to have anything to do with it in the 3am phone call from Ola. Essentually it's Fredo's weak and niave nature, IMO that got the best of him, it's evidenced when Fredo said "You guys lied to me -- I don't want you to call me anymore" to Ola over the phone. It's my take that he was blinded by niavity, jealousy and greed and this combined with his good and trusting nature didn't really tihnk it was going to be a hit. He then distanced himself from it and finally realized how stupid he was in Mike's house after Cuba, although he could have deluded himself or even has a concious inclination of the possibility, I think he was blinded.

"A piece for me" line (quote correct?) was the ability for him to be a man and earn and this in a niave child-like way was an attempt for him to grow some bigger balls.