Ok but you could replace the "Sending notifications about new listings in real time" duty by subscribing to zillow/redfin etc with specific filters... for free. It's hard to make the argument that that's worth 6% of a of half million dollar purchase? I agree it's a part time job to be a buyer in this market, but I don't think the buyer's agent really makes that job much easier in my experience.
"Answers a call at any time of the day" is definitely a great nice to have, but I suspect that puts your particular agent in the top 10% of the field. Most agents I have used will just let all phone calls go to voicemail and then text back or call you back hours or days later. YMMV a lot on this one.