Why is V-slot so much more expensive than T-slot

Aluminium Extrusion Profile - TV-Slot - Cut To Size aluminum v slot Of numerous aluminum extrusion profiles, v-slot and t-slot aluminum profiles are the most common ones Sometimes they are used interchangeably, but they are not aluminum tslot Download scientific diagram V-Slot aluminum profiles' types and dimensions from publication: Design and Implementation of an Urban Farming Robot

aluminum tslot framing V Slot 20mm Gantry Plate V Wheels Assembly Detailed assembly of 20x20mm V Slot Profile