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Yeah it's hard to tell... it doesn't seem to be specified on their website anywhere.

Monstermarket said they will send you 60% of their revenue on your purchased card to you.
The standard cut on card from the seller is 5% (it is also market revenue) so you will get 5% x 60% = 3% back to your pocket
If the cut is 4%, then you get 2.4% back, etc ...

Thank you for providing such a good answer!

Ah awesome! Thank you so much for clearing that up for me.

It's been 3% for a very long time. I'm fairly certain that is what it is going to be.