@Frank Jiang I can definitely understand that point, but I think it's worth noting that most buyer's agents who are saying that are NOT talking about working with an experienced investor, and for that reason, it is still valid. I'm an agent, so my PoV may be a bit skewed, but allow me to explain...(I'm going to jump on my soapbox...this comment is not targeted at you, just my .02)
Most people I work with on the buy-side are not @Joe Scaparra. Joe even mentioned this in his response that an agent can provide great value to their client on the buy-side...but of course, that's all contextual. He has the experience/know-how to navigate the process and make it work in his favor. Most people are not Joe. Even newbie investors who say they are looking for an "investor-friendly" agent most times wouldn't be able to discern the difference. In my opinion, there are good (or great) agents and there are those that are just average/bad. A good or great agent can discern what his clients need, work within their parameters, and help them accomplish their goals (whatever it may be: investing, buying retail, etc.). An average/bad agent just helps paperwork get pushed through and deadlines get met.
I think we can agree that a retail consumer can benefit from working with an above-average buyer's agent, they may reduce their own out-of-pocket costs...heck they may even put money in their pocket by doing so. Why? Because they don't have the understanding, the resources, or the experience to act in their own best interests in these situations.
Now let's also take a look at the experienced investor...why should they work with a great buyer-agent? Focusing on their Return on Time (RoT). We all know about RoI, but we often don't think about the usage of our time and how it can relate to $$ in our pockets. If you are primarily finding your deals on the MLS you (in my opinion) owe it to yourself to find a great agent to work for you. The amount of time spent finding the deal, writing your paperwork, negotiating back-and-forth, coordinating conveyancing, etc. is better spent for the investor on higher $/hr activities.
I truly believe that great agents are valuable for anyone; however, with the barrier to entry in the industry so low the "average" is pulled down quite a bit. The way that technology is disrupting the real estate industry, I believe that agents will either have to get better or get out...and that is a good thing for everyone!