Control wards, how to do it with the gold cut?

So i regularly play a support and while i often leave the control wards for the adc's to buy i know some Supports also buy them and i was thinking that maybe i should also start doing this more but now that we have this gold cut at the end of the game i feel like i may be short on gold when i buy too many control wards.. sure they're not overly expensive but if your income just stops late game then any gold misused is a tremendous loss... i'm not sure if this got taken into account, what do you guys think and how do you guys usually manage your control wards?
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