Question on this STR Spreadsheet I found in bigger pockets

[Chris Gerard]

Hello,

I found this link to this short term rental calculator: https://www.biggerpockets.com/blog/wp-content/uploads/2021/06/STR-Calculator-V2-Locked-.xlsx

It is very helpful and appears to be a useful evaluation tool. I understand all except one part: If you go to the "results" tab at the bottom of the spreadsheet, line 27 where it shows the "profit at sale" row, I'm trying to understand why there are negative numbers for the profit? Seems like this number should be quite a bit on the positive side... And also in line 28, why the cashflow plus the equity is important? (obviously line 28 is based of line 27 data). 

Thanks for any insight.