Thanks @Carrie Matuga.

They carry forward but would be much stronger from a tax planning perspective if they were used to offset active income. 

Thats why agents are required to carry Errors and Omissions insurance, which isn't free.This is a free market, so if you think it's easy to lower prices and still make money, feel free to start a title insurance agency or underwriter.

@Sal Grimaldi are you referring to owner-financing where the seller carries the note on the property? 

We ran over schedule, went over budget , I paid additional carrying costs every month, and learned about significant issues later than I should have.

They carry their own insurance, wc, etc. 

.* How does it benefit the buyer when the owner carries the loan? 

If your contractor is so rigid and broke that he can not or will not carry a few days of work you need a new contractor.

Otherwise, you will be carrying 10-20 debit cards someday.

Doing a 1031 exchange (properly) delays and defers and capital gain tax due, but carries over your tax basis to the new property.