Lifetime OBC is given to Star Program Members and a few other important Groups.
I thought Star Program members got 1 year of free OBC??? And AFAIK it isn't given to groups. It was available for purchase back 5 - 6 years ago, and people that purchased it (such as litozinnamon) got to keep it when they took it off sale.
In my opinion, it will be very expensive and OP. But I don't think it will be so demanded 'cause of high price and not having special perk (OBC has DevEX, that's why it's demanded). The only thing that I see interesting is the fact, that it can has infinite limit of groups joined. Yeah, 100+ robux per day is good but you can better buy robux instantly than overpaying for perks.