Are people really getting weird about where Spurs play, who cares? There is a huge difference between say moving all your big home games to a local bigger stadium to get a financial advantage but playing the rest of your games at your normal home stadium. That's the reason for having one home stadium, a new stadium is a pretty much a once in 30-50 years thing at most, why anyone would care about it I really don't know.
Financially speaking I did wonder if Spurs actually gained from being at Wembley and if it would be a strange quirk that last season might be more profitable than their first full season in the new stadium as at least in the first year they had some pretty decent attendance numbers and still do for big games iirc. It's a horrible stadium though, went I think twice and never again. Stupidly it was much nicer for the game to go all the way to Cardiff to watch Brentford and Arsenal than it was to go to Wembley after. Depending on the cost per game to Wembley 80k tickets vs is it 62k could be a drop in actual income, though still way higher than before that.
In terms of first game there, I went to the Bergkamp testimonial, wasn't full, and I went to Brazil vs Argentina but I can't recall if I got to go to the first league game... general sale was probably tough as hell for that game. It's not that big a deal, it's as with the seeming test event, it's just a way to make sure there are no issues before a league/competitive game gets played. There was Bergkamp t-shirt on every seat and because we were high up behind the goal with loads of seats empty me, my friend and another 20-30 arsenal fans went around getting all the free t-shirts we could carry. Still have a bunch of them around somewhere in a box with my old Brentford and Arsenal shirts.