What's something nobody tells you about Real Estate Investing, but should?

[Katie Miller]

Title says it all: What's something nobody tells you about Real Estate Investing, but should?

I'll go first: THE MAIL! and the TEXTS! It's overwhelming. I've never gotten more snail mail in my life (mortgage statements, bank statements, invoices, etc.) and it seems like every time we turn it to "paperless" options, the mortgage is sold and then I get all new mailed statements to turn off again. Also, all the texts/calls from people looking to buy my properties... I'm not selling! 

What's something YOU learned that nobody talks about in Real Estate?