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It's not just the matchday revenue, which is a big thing, as long as there's fans willing to watch the match in person, its a constant. But it's also the fact that the stadium is multi use, the 10yr deal with the NFL, another place to stage big concerts in london, all adds in to revenue that comes from a new stadium. Also corporate boxes, we don't have that many right now, naming rights to the stadium, it all adds up..
New stadiums (as long as you have enough fans, and the football is good enough to fill it) is the financial bedrock of any team, plus the big carrot of television money..
A new stadium for Spurs won't have a huge positive financial impact in my opinion.
Going on 2014 figures, Arsenal matchday revenue was worth £100m compared to broadcasting revenue of £123m. In the same year, Spurs matchday revenue £43m and broadcasting revenue of £95m.
If Spurs more than double their matchday revenue to £100m that is only an increase of 2 Soldados a year before tax.