You need a minimum of 100K playmonney chips in order to be able to send them... for 40 cents. And they wont give you more than 0.01$/2.5K chips if you sell more, it's always the same ratio. In other words, if you start playing high stakes playmonney chips, which would be NL20K, it is the equivalent of playing with converted blinds worth 0.0004$-0.0008$. It's probably better to grind playmonney Sit n Goes, since the highest buy in would be 200K playmonney chips, or 80 cents.
I remember once I martingaled HU SNG and started from 1K to 200K in one evening, but then I lost them all in 2 sit n goes
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