Exchange hero points for iso

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Lots of games have systems for exchanging the "premium currency" (in this case hero points) for the "common currency" (in this case iso). MPQ lacks such a system. Why? It is much needed!

I have lots of hero points and I don't know what to do with them, because I don't need to expand my roster, buying single covers is way too expensive (1250 for one cover is just madness), and buying cover packs just seems too worthless, you get too much **** in the packs...so well, I spend hp on shields and then get even more hp back. Not really a problem, but what should I do with all my hp? I need lots of iso right now but I don't get enough. I would love to exchange 100 hp for 10000 iso. That's only ten levels for a mid-level character or five levels for high-level character. Would I spend 100 hp for such advancement? H*ll yeah!