Hey @carrianne 
As the others have said, itâs not about need - ask yourself, do I want a charging plate? Personally, I didnât want one and didnât think I needed one, so like @Susurrus I bought small selenite sticks to put them in the pouch with whatever item (crystals, runes, cards) so they cleanse while theyâre resting.
However, I was in a spiritual shop and this small selenite bowl called to me, and I must say it is useful for cleansing many crystals at once, for example after a crystal grid. Also, I use it to cleanse any witchy items overnight, then in the morning I sound cleanse, just to make sure the only energy they are charged with is mine 
x Blessed Be x
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Since you opened the box on real/fake/misnamed crystals,
I wanted to add this post on Satin Spar vs Selenite to the list.
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Can open, worms everywhere 
Now Iâm going to see if we have any others for common stones.
Edit:
I found these too @Artemisia
Physically Cleansing Crystals: Save this Chart! 
Does Selenite dissolve in water?
I use Selenite all over
I have bowls, plates, wands, a spiral tower, athame, slabs/pieces/bars. I use them all around my space & in my box where I have some stored.
I will put crystals, jewelry, runes, & other items on them too. I have clear quartz pieces near them & around my room.
I do the same with smaller pieces & keep them in my crystal pouch for the day. A small piece of selenite & a small piece of clear quartz with any stones, runes, charms, or whatever is in there too @Nikki-Phoenix! I keep a piece of clear quartz with my decks & selenite because right now they are all in a bag still in my room. I need someone to go downstairs with me so I can put them away properly 
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