I think I read somewhere that you can only vote 25 times per day, but I was able to vote for other people's, so I suspect there is a limit on how many times you can vote for a person as well.  

Not even close to the same as defaulting on a bank loan because not paying an individual's loan would screw that person. A

I'm going to go back to my original constructive criticism of marketing to one person.  A

Make sure you structure the deal to show this (i.e. a land trust with the main person as trustee for title). 

Do not let them intimidate you and as many have said bring a friend or at least another person. As

The odds of them not becoming sleazy and changing their whole persona is slim to none.Once in a while you get a bad apple and just have to move on.

Friends always expect friends to be more lenient than a business person , as in running late with the rent, having to use the rent money to repair the car etc.

Other than that your question is very general and you may want to be more specific so you can get better answers.How much you should spend for a home sounds like how much you should spend on a primary residence and that would be a personal answer for each person, as it will depend on your budget.If you're talking about investment properties then that will depend on your investment criteria and required returns, criteria, etc.

A natural person, a corporation through its officers, a partnership through its partners or a limited liability company through its members or managers that deals in selling, exchanging, purchasing, renting, leasing, managing or pledging the person's or entity's own property, including cemetery property and membership camping contracts, and that does not receive special compensation for a sales transaction or does not receive special compensation or other consideration including property management fees or consulting fees for any property management services performed, if the majority of an officer's, partner's, member's or manager's activities do not involve the acts of a real estate broker, 17. 

I think a lot of people come into the industry ill-prepared and fail at it and there is this persona of how horrible it is to own real estate.