In my honest opinion, premium seems pretty useless. There should not even be GA energy, the 20% or 30% exp rate is useless once you're max, and daily boxes should be given to everyone since the rewards aren't all that life changing and I think they are benefits that are well worth it for just being logged in but of course I would say only 1 daily box a day because people will have characters like "iopenbox1, iopenbox2,...etc" taking up server space that doesn't need to be and for it to just be 1 time every day someone gets a daily box. It'd also help the lowbies a TON when they get teletickets and other things that will improve their leveling and gaming experience by SO much.
You'd make more money anyways from people wanting more and getting greedy. As in when new people come and they use that 10 minute exp medal and say "aaawww thats it?!?! That was freaking amazing! They have 1hour ones?!?! Even 6 hour 300%?!?!" which is how you could get people to stay and want to spend their actual money to use those things.
In conclusion, premium should be gone.