Well, at the risk of sounding pedantic, Ricky does not perform the Dream of Aces. The routine he performs is a variation of the original which predates "Dream" by many, many years. Ricky's offering is a combination of this idea with the patter from Erdnase.
If one were to perform the combination of McDonald's Aces with the Erdnase patter, you would be ethically and artistically in the wrong. If you were to perform any ace assembly with the Erdnase patter because you saw Ricky do it, you would be ethically and artistically in the wrong. If you had never heard of Ricky, read The Exclusive Coterie, and performed it because it appealed to you - then you would be fine ethically, but it would be an unwise move commercially and artistically as you would be performing something VERY similar to the established work of another.
Now, if you happen to find Dream of Aces at your magic shop, and you buy it and perform it as is, there is nothing at all wrong with that. If you were to begin researching Ace Assemblies and picked one for your use, there would be nothing wrong with that. The Ace Assembly is truly a classic effect with hundreds of variations. Ideally, if the reason your pursued that was because of Ricky, you are on shaky ground, but as a card worker you WILL encounter this plot sometime and it is reasonable to want to explore it independent of Ricky's work and influence.
As to the Three Card Monte, it comes down to your motivation. Though it is a classic routine, if the true and honest reason you want to perform it is because of Ricky then I personally feel you are not on ethical ground. So many times there are amazing tricks sitting right on our shelves, but we never think about practicing them until we see someone else do them. That is taking away from their work, their vision and their uniqueness. I feel that is wrong.
Now, if you happen to have been studying Vernon, learned the routine, and then found out that Ricky killed with it, you are on perfectly fine territory. The routine is a classic, the plot is a classic, and there is nothing so associated with Ricky about that routine (like his marriage of McDonald's with Erdnase) as to prevent someone from using it without being seen as a clone or copy. Now, if you lifted his script....
As to Blaine and Fechter's Be Honest, What is It, I disagree. If the reason you wanted to learn the trick is because of him, and not your own research and discover, then you are trading on his work. You are "copying" and no matter how tempting it is, in the long run, it is wrong.
Ultimately it is about your motivation. Ultimately only you know why you want to perform a trick. But then again, art is about these issues and explorations. It's not about being the magic police, it's about being true to your own vision and respecting the vision and work of others.
Brad Henderson