It bothers me that people seem to assume that the seller has malicious intent, to mislead the customer into thinking they are buying something they are not. I don't see that.
While I do not agree about the sellers intent, let's move on quickly to the other point here. This isn't just abut the seller, but also about the buyer. These "custom" figures are going to end up in one of two places. 1) In the hands of a collector who purchased it because of the cost prohibitive nature of the legitimate figure. Or 2) In the hands of someone who will try to re-sell it at an inflated price by trying to pass it off as a legitimate figure.
While there is no harm with scenario #1, scenario #2 leads to many problems. The FACT that once these leave the original sellers hands, there is no guarantee that they will be labeled as custom in future sales. The FACT that because these are now on the open market, and no one knows where they end up, the entire translucent variant market will be jaded by possible fakes. No one will know if any green figure is real or not. Not to mention any possible future or past translucent variants. If he has made green versions, what is stopping him from making red, clear, blue, or any other color that may come out? We know he has the ability to mold, repack, and tint the resin to the needed color. It is just a matter of desire now.