How much RP is too much?

A while back on some other account when i started league, I bought a lot of RP. I bought champions (which was stupid of me), skins, wards (even worse), and hextech crates and keys. I spent about 150-200 dollars and bought 1 10 dollar RP card a week. Now I just don't know how much/ how often i should buy RP in moderation.
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