Work as an agent & wholesaler: is it unethical?

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Hello to all, 

Disclaimer: I have not done a deal yet, nor is my RE license hung on any wall. 

But it has got me to thinking. I will be getting my broker license eventually, and will get my first wholesale deal soon through hard work. But my question is this. Is it ethical to act as both? Obviously I don't mean on the same deal, but lets say you talk to a seller as an agent, and realize that they are motivated, so can you tell them that you are also an investor and would like to buy their home quick for cash without taking it to the MLS, and proceed from there. Vice versa, if a seller you marketed to as a wholesaler ends up wanting to take it to MLS, and you step in and say I am also an agent, and could represent you. Obviously, all this takes into account that in your PSA with sellers as a wholesaler you have agency disclosures and all. Is this illegal? Is this unethical? Thank you in advance.