Haha even i with math "3" could do those calculations within hour. OK i would use calculator not fingers for that.
Income from fanshop and catering is connected with attendances.
Currently i have 120k in every match, even against bots. Every visitor bring me 120.91845 € now and on 200k stadium they will bring me 135.44445 €- rough difference rounded down is 14.5 €. It's calculated stadium+fanshop+catering divided with attendances from stadium page.
Let's imagine that my attendances will stay on 120k on new stadium(actually they will vary up): every home match will bring me 1740000 € of bonus. I have 18 home matches it's 31320000 € per season minimum.
I didn't count stadium maintenance costs yet: 1108960-567616=541344 per week or 28149888 per season more. So it's 3.17M per season remaining. 1266:3.17=400 seasons :D
Awful you failed, damn optimist :D
P.S. Ofcourse i didn't count that some matches will be with attendances with 150-160k and some seasons of that long period i will play in higher league where stadium may get full. My popularity will rise too. Those things i just can't predict in.
From other edge(always 200k) with 2900000 bonus per match would bring +52.2M per season. Counting down prementioned costs it will be 24.05M profit per season. Only some 53 seasons...something must be very wrong here because it's not possible that Awful's stadium would be more profitable than my.