Yea star upgrades are a much better ratio then buying fg straight from jsp and it is 100% legit/allowed they have a sub forum for it. I wish we could still buy MTGO tickets for $1 and sell it for 100+ fg lmao.
Just posting this here in case anyone wants to try to make some fg. Free to sign up and the prize pool is over 4000 fg and going up. I recommend joining up since it is free.