If they have money to spend then its good they try this since those VIP could able to see what they are offering and if Metawin didn't offer any VIP transfer program then those people will remain loyal to the casino where they are currently playing. At least they try to offer something new and with that for sure that the other VIP will test out what Metawin could offer to them. Then it will be beneficial to them if those player will also stay or make their casino as their one of their option to gamble when they are exhausted and just want to try other casino to test out their luck.
Although we can't deny that their would be an abuse will happen but for sure Metawin already know this.
Your point is correct but what I think @xlays simply trying to say here that some VIP especially high VIP level on other casino will just play due to bonus offered for this transfer program since they are already heavily invested on their account with other casino that’s why he mention the 50% chance of converting this VIP player to stay loyal.
On the other hand, Metawin is confident enough that this new transfer VIP will stay due to their promotion offered in the casino not to mention those tournaments and VIP benefits that has high value of rewards compared to other casino.
Established casino usually decreases their rewards when they are already settled on building their loyalty user. I think Metawin target are those VIP players that already done to the new adjustment of rewards on established casino which this program is very beneficial.