600$ for a ninja whose cost in Germany was 12-15k coupons seems good to you?

Good for you, as a big spender myself I disagree, as does 99% of the playerbase. You are entitled to your opinion and is to ours.

Recharging any amount equals spending money. You cannot get ingots back into $$ so hiruzen costs 600 this week, it is not free.

You want to lay that much for a ninja then knock yourself out, but saying that he is free is a dellusion.

Yes you can convert those 30k ingots into other stuff, but would you have gotten so many ingots any other week? If the answer in no then you are spending those 600$ for Hiruzen.