Since a lot of people here seem to be confused (or are just shitposting):
Nijigen Expo is a convention series in Malaysia. Despite "Niji" in the name, it is not related to Nijisanji or Anycolor.
Nijigen Expo paid Anycolor to have the talents perform a concert at the convention.
Nijigen Expo are the ones who hype it up as "FIRST CONCERT IN SEA". They're the ones who tried to make it such a big deal, while for NijiEN, it was just yet another convention concert appearance, nothing too special.
NijiEN have done many of these concerts at US conventions already, so it's not their "FIRST CONCERT".
While the NijiEN talents tweeted about the concert announcement, Anycolor never made any push for advertisement. Because Anycolor wasn't the ones directing for the concert to happen - the company already got paid.
The price was set by Nijigen, not by Anycolor. The North American convention concerts that NijiEN have done have been $20 or less, sometimes free (AX, SeriesAi), showing that it's up to the conventions to set their own price.
The $80 price included venue exclusive t-shirt, 2 multi-colored lightsticks, and commemorative tickets (all NijiEN branded).