For curiosity I checked Ticketmaster on Friday morning. There were still about 100 standard priced tickets for Cher remaining. Plus at least 200 tickets for resale, some as low as $25.
The two seats next to me remained vacant the entire night. I'm pretty sure they were unavailable when I bought my tickets.
Cher is in Boston tonight. I checked and there are hundreds of lesser quality seats still available, maybe even 1000. Lots of nosebleed seats for $28.75 Even dozens of lower level seats for $67.95. Plus many for resale. Hmmm, I wonder why they're so much cheaper than Philly (and I'm guessing NYC) prices.
As we were deciding on tickets for Celine Dion, I noticed a whole block of seats near where we were looking at, which the days before, were marked at a higher "Official Platinum" price of the $300-$455 range, were suddenly dropped down in price to "standard seating" at $200-ish. Meanwhile some of the seats in the section we were looking at were randomly, suddenly priced up at the "Official Platinum" prices.
Since the seats we were thinking about were at the "standard seating" price, and we didn't want to find they suddenly jumped up in price, we decided to get her tickets. I just went to look at the seats available, and yep, the few seats left in my section are now at a higher price with VIP perks included for the higher prices, yet they are further back too. As I get older and am decluttering all my stuff, I'm not interested in those extra perks that will just end up in a drawer.
Makes me realize that I never have to buy tickets the first day they are available, unless it is someone (like Kanye,) guaranteed to sell out. When Ticketmaster says the seats "fluctuate" in prices, they really mean it, and I can probably get less expensive tickets later on, as the "Official Platinum" price seats are dropped in price. It's also nice to know that the
scalpers resalers have not already gotten the best seats.
Perhaps, as the tour goes on, and others in different cities are getting word about how the prices fluctuate so, people are waiting in Boston & other places before buying tickets?

Maybe they already know about this price fluctuation thing already. I didn't. If you hadn't mentioned how cheap the nosebleed tickets were, only a state away, I never would have gone to check the prices here again to see if there was anything decent left at a price I'd be willing to pay. Again THANKS!
Also, people might also be waiting to see other people's photos of the tour. I didn't think till after we got tickets to Cher, and were considering ticket to Celine, to see if photos of the concert were already posted by others. It was then that I knew there would be no bad seats for Cher. If one is considereing the nosebleed seats, no need to over-pay for her.
For Celine, however, from the few pics I've seen, she will NOT be using the backdrop as a large screen of herself. (She does one song dedicated to Rene, and he's on the screen behind her and the kids.) Depending on the venue, one has to depend on the screens the venue may have already up. Barclays Center has 2 screens on either side of the stage, over the side audience sections. So, if we chose seats off to the side, yet closer, we'd always be seeing Celine from the side, or we'd have to always be swiveling our heads 90 degrees to see the screen.
This was MSG when Cher didn't use the backdrop as a screen of herself. Unfortunately, Barclays Center will look the same for Celine.

Close enough to see
well, but not close enough to see details of her face or the screens well enough.
We've got practically the same seats at Barclays. Either, we'd have really good seats for both concerts. Or, we'd learn if we need to do anything different for Celine. We'll bring a couple binoculars to watch her ballads. (I did bring my opera glasses, which work for Broadway shows as the venues are smaller. But we were too far for them to be effective at MSG. And we didn't need them for Cher.)