Why you have to pay for unlimited version?

[kitercuda]

I spend a really lot of time with developing this application, working from Mondays till Sundays, does not matter if it is holliday, Christmas etc. Application has more then 40000 lines of Java code.
Testing application in real is expensive - I test in Cessna 152, Zlin 142. Zlin 43 amd Extra 330.