Honestly it depends on your situation, if you are on a server with people who will outspend u and u want to spend mostly just to get the character u want eventually and not break the bank. You could just convert your ingots to coupons to buy things through the Try Your Luck event and then buy what u want at a reduced price than most events anyway. This is the slow way though but good to keep in mind so that u get the most out of what u are paying. 300ingot can be changed to 600-1500(wishful) every month. More of just a friendly reminder to set aside an amount that can be used for this when u do spend