I dont think it worth it..., As point expiration date stay the same...
And it cost money... up to 230$ (since its max 800 points)
Better make some vouchers for upgrades...
If you have S class and upgrading to D with points, If you do it the right
way, you earn more points than the voucher...
(D=200,S=100 and GL/PL Additional bonus points might bring you to
more than 125 which a voucher cost those days)