As a realtor, I did ask people to get prequalified before I took them all over the planet in my car, however, even axe murderers can have decent credit. Once a guy became insulted and wanted me to take his word for it then became irate and walked out, to which I said good riddance. Nowadays, a realtor cannot afford to drive them all over if there's no way they can buy a house. If someone wants a tour guide, let them hire one who isn't paying all her own expenses out of pocket BEFORE she gets paid.
No commission is standard; it's a federal law. They are negotiable, but that depends on the company the realtor's license is with. I was not allowed to negotiate mine down even 1% unless they committed to sell then buy with me as well. I dont like the 7% either, but the exposure to the multiple listing service can be invaluable, especially in today's market where people are not that willing to just drive down every street looking for houses for sale.
With the internet, you can sell your house on your own, but you need to do research and educate yourself on what is legal to do and what isn't, where to get a valid contract, etc.
I often thought about how dangerous my job was-after all, you do not do background checks on anyone. And two realtors were murdered here in the last few years inside their model home. You need to think about it, too-just who is coming into your home.