referring to the white-paper: https://crowdvilla.io/whitepaper.pdf page 22

Ancillary VIP Token (REI Token)

REIDAO, the platform builder of Crowdvilla, will generate VIP Tokens known as REI Tokens. Although not native to Crowdvilla, holders of REI can earn rebates on the Points used to book for their hotel stays.

Percentage of rebates are subject to the number of REI they hold, shown in the tiering below.
Holders will only enjoy the rebates if they lock-up their REI over the period of their stay