Real estate falls into the same categories as: taxes & death; there will always be a need for it. 

It also varies by how much you want covered and what deductible you choose.

Those types generally like to buy in more affluent and high quality location areas.Sometimes investors have to buy in more moderate areas as the property meets their rent ratios they just can't afford a 300,000 rental for example in a high end area even if it throws off 3k a month.So it really varies across the board.

Ask them what they see expenses running per category per unit.

I'm assuming that they will be much less likely to sell than an heir that is detached from the property.The list I get in Harris County is in two categories. 

Wouldn't wholesalers be in the category of loan sharks; preying on the "motivated".I assume they have some special skill that does provide a service to the motivated?

Get an estimate, it really varies based on the exact job.

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You are correct that the percentage is going to vary based on a number of factors.

@Alysia Young  - 30310 varies wildly from "ok" to "not good at all but could be worse".