Here is something more sensible

2006
- 280000 cost studio
- 20000 interest% to the bank
+ 0 rent
2007
- 20000 interest%
+ 35000 rent

2008
- 20000 interest%
+ 40000 rent

2009
- 20000 interest%
+ 40000 rent

2010
- 20000 interest%
+ 40000 rent
2011

+ 500000 net sale

275000.00 total profit for doing nothing