I'm in on the machine but have zero intention of paying more to be assigned a specific number. To be honest this leaves a bad taste in my mouth. I'm not entirely sure why as I can't say that I'm especially bothered by whatever number I'm assigned but it does feel like the business is trying to squeeze every last bit out of the customers with this.
Is it good business practice? Well, it will make them more money on this game but as an existing customer I suspect it will make me be less likely to commit to something in the future.