Otherwise you get into silly situations like if you sell bitcoin to re-buy more, you are helping Bitcoin, etc...
I've helped
more than 100 people buy Bitcoins for the first time by reselling Bitcoins.
Most of them probably would have bought eventually, but more than one has told me they only bought because there was somebody in their area with a good reputation that was willing to meet them and explain the process.
Maybe that's not what you meant, but it certainly is one way to help adoption of the currency grow.
No, I meant something like "i'm going to sell my Bitcoins on Gox, so that through some method (like the one in my sig *blatant plug*) I can obtain more Bitcoins later, and thus by obtaining more bitcoins I have effectively forced the purchase of more bitcoins, driving the price up, helping bitcoin."
Thats why I dont consider causing a price increase like the OP is doing to be necessarily "helping bitcoin". (I'm not saying its hurting bitcoin, just that its not really helping it as you imply).