I played lots of FTP MMOs. You know how the upgrading works there? You get upgrade items with real money. The higher the upgrade level, the lower the chances of success. The last upgrade level on one game had a success rate of 0.01%. You could have spent thousands of dollars and still not get your upgrade.

Just suck it up, OP. This game is extremely generous with success rates and I really don't see how anyone could blame SE on this one. Good luck next time.