Is there conflict of interest for someone who wants to get a sales license, but interested in investing?

As soon as you become licensed, you are required to follow certain ethics of real estate and also notify any party involved that you are a real estate salesperson. Therefore, the other party would know you have the ability to view all information regarding certain properties.
Also, since you would know much more than the average investor, you would be expected to not offer an extremely low offer. Most say to offer close to the asking price to keep any unethical questions out of the picture.
Just some additional considerations.
David H Wilson

In the vast majority of states, you would have to disclose that you are a licensed real estate professional to any party that you are purchasing from. What I do when I buy property for myself is include the phrase "Buyer is a licensed Real Estate Professional" on the purchase contract itself. I have yet to have a seller nix a deal because I was a real estate broker. Sometimes I speak with sellers after a successful closing and they confide in me that they were comforted that they were dealing with a professional buyer.
I respectfully disagree with the notion that because I'm a license real estate broker I'm expected to not to offer an extremely low offer on a property. The only requirement once you're licensed is to disclose that you are licensed, that's it. I don't care what the asking price is on a property as I will offer a price that is in line and makes sense for my own investment strategy. Some sellers out there are disconnected with the current market and are asking comical asking prices for their properties. If I like a property on the market but not it's asking price, I am not obligated to offer close to the asking price just because I'm a licensed real estate professional. That is absolutely false. I can legally and ethically offer any price that I wish and the seller can either accept, counter or decline the offer as long as I disclose my status.
I always recommend that investors get licensed because you learn a great deal by going through the process. Not so much from the course/exams that you are required to take, but more so from if you take a job in a real estate brokerage and get to assist/mentor off current top producing brokers/agents. Most importantly, you'll learn how to acquire information. And information in the real estate investment world is powerful and potentially worth a great deal of money. If you really love the game of real estate investment (like myself), I believe it makes sense to totally immerse yourself in the profession.

It just depends on what level you want to invest.If you are a big time player you count on commercial brokers such as myself to do the legwork on the deals as you the developer/principal do not have time to work on such things.
As far as ETHICS go the first poster is misinformed. Liscense law does not cover ETHICS. You can have a liscense and are held to disclose you are a broker/agent inthe transaction but you are just bound to state liscensing laws.
RESPA (real estate procedures and settlement act) DOES NOT apply to commercial activity.This is one most residential practitioners do not know about.
Now if you decide to become an agent/broker and you want to belong to the NATIONAL ASSOCIATION OF REALTORS then you agree to bebound by there ethics decrees and sanctioned if you break them but it has nothing to do with state liscense laws.
Some brokers you join require you to be a realtor thereby making you automatically bound by ethics but it is not a requiremnt by state real estate commission.
No legal advice

No it's not a conflict unless you put your investment needs above those of clients.
Most brokers are investors.
However, the prior responses requiring disclosure are correct.