It's not a question of not wasting time or poke-penis size (or as you said, having a pitfful thread). From my point of view, It's like sponging other people's efforts and only other people's, never adding your own, and profiting on that.
Sure, you are trading one poke for 3 pokes, but these three were done by other people. Not you, never you, at least so far.
As a moral philosophy teacher I'm surprised you never looked what you do from this point of view. It being right or wrong - I won't go into that discussion with someone who seems to be well versed into morality.
However, if It wasn't an issue, things like redistribution rights also wouldn't be - as at their root is the principle that someone is getting some kind of profit from someone else's work.
That being said, as I said, I'll go through with the trade. But I'll ask for credits in your thread, and I'll only use this credit on pokes RNGed yourself - whenever you decide to learn to do it.