I see it as 150$ for two 4h concerts and a 2-3h long bonus concert (don't really know how long the Deco*27 stage will be)
If you consider how long the Holofes concerts are (3rd Fes was a total of 6 hours long), thats pretty good bang for your buck. Most big-name celebrity concerts here cost the same but are at most 2 hours long.
With 13 new appearances and a wholly new stage, I can see 4th Fes being a total of 8-10h long. Thats a lot live music performance!
Yes, the price is steep but if you just limit yourself to the one day with your Oshi, then thats 50$ and thats a fair price imo
But even if officially you aren't supposed to, I do keep my private copy of the VODs of the Fes because I do occasionally re-watch them