I know that it depends on many variables (age of the house for example) . 

With a variable APR and higher interest than a conventional loan it seems like you would want to pay that back as soon as you can right?

Supply and demand. 

Just tooo many variables and things to explain.

Every deal is different, every market is different so how can you apply a "typical" standard to a variable situation?

While wholesalers essentially do the same thing, no question, the good ones go above and beyond in providing accurate lists of repairs, supplying contacts to help the buyer if the deal goes through, or to help the seller if the deal doesn't go through.

Your approach will depend on your level of experience, amount of capital, and supply/demand forces in your market niche.

The application and late fees are an additional income.The admin fees are a number of fees including phone, licensing, office supplies, bank fees and credit/background checks.Maintenance salary is a repair expense, not a management expense.Service contracts do not include capital repairs.

There are a lot of variables to the quotes such as the space it's heating (the units come in different sizes), amount of line that has to be run from the propone tank, etc.

I took off work the other day to go buy supplies at Staples.