One suggestion I would make would be possibly different tiers of items to open. Costing more the higher you go but with better perk chances or damage/hp/str or maybe guaranteed 2-3+ lines of stats. Just a thought. :)
I added a big chest purchasable for 100 gold: more chance of having more stat lines and more chance of having big stats!
Don't hesitate to give me feedback if something is wrong with that chest. :)
Awesome thanks! I will keep my eyes open!