In case someone was keeping track, that was probably the longest stretch of time without a discount on GTA 5. The last time the game had a discount was in late April, also on the PS4, incidentally.

Previously, sales featuring the game were so numerous that they practically ran back to back, only shuffling which platforms were involved. These frequent sales are one of the ways through which Rockstar has managed to keep the game's non-discount price still at the $60 mark, three years after launch.
May Madness, lasting until the first of June, is one of the biggest Playstation specific sales Sony has going on. It includes over 100 discounted titles across the PS4, PS3 and PSVita, including a wide selection of digital-only deals as well. The GTA games have been frequent members of such discount promos due to their immense popularity and brand recognition.