The usual practice in digital comic books was to wait a while after initial publication and then drop the price of your comic by a dollar. $3.99 become $2.99, $2.99 become $1.99, that kind of thing. DC Comics used to wait 4 weeks, but in 2013 extended that to 8 weeks. Image Comics usually drops to $1.99 after a month. Marvel waits a lot longer, around 18 months or so.
But with DC Comics relaunching at the $2.99 price point for Rebirth – how long will people have to wait until the books drop to $1.99?
According to Comixology, DC won't be dropping the price of their digital Rebirth books as a matter of course as they did before.
Hi! Starting with Rebirth #1 on 6/11, DC Comics same day digital comics are no longer dropping in price weeks after release.
— comiXology Support (@cmxsupport) July 27, 2016
Sorry for the delay, Brian. DC Rebirth titles are not planned to have price drops
— comiXology Support (@cmxsupport) July 29, 2016
In DC's case, they drop by a dollar after 2 months. It was originally after 1 month, but it changed a while back. But now it looks like the Rebirth books won't be dropping at all.