The minimum staking requirement right now is 4000 PRE tokens. Then you have to get hosting (I'm using Contabo, but I've heard positve things about Vultr or Hetzner as well). These cost anywhere between $5-$15 per month.
I've created my node in September 2021 and have earned 1944 Pre tokens (see screenshot) from 1 node, which is around $85 dollars.
Might seem stupid, but nodes are a long term passive play especially if it's a good product.
If/when Pre goes back to its all time high of 0,75 that would be (1944 x 0,75 =) $1458
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Now imagine it goes way beyond that (which I think it will). Also imagine running 10+ nodes.
So nodes are only good if you like long term plays. The rewards might take a while to come, but once they come, they will be well worth the wait.