As a QRP DXer you have to pick your battles. As I have mentioned, I am #1 Honor Roll running QRO and so I still have some of those tendancies, that is, just jump into any pile-up. A case in point was the just ended 9U4U expedition to Burundi. I spent a lot of time in the pile-ups trying to get a QRP QSO and with the masses calling I didn't have any success. Now, in full disclosure, I am using a gain antenna on 20 - 10, an 8 - element Log Periodic at 50 feet, so my hope of making a QSO in the pile-up wasn't complete insanity. However, the zero QSO result of that strategy speaks for itself.
Then came the opportunity. 9U4U was calling CQ on 12m SSB on Saturday morning, local time and when I dialed the KX3 to their frequency, no-one was calling them on his listening frequency 5 KC up. Perfect. QRP'ers know that the best time to QSO a significant DX-pedition is toward the end when most have their QSO's already. So, I was on the favored battle ground for QRP'ers, an open frequency. I called twice, nothing, CQ CQ, I called again, nothing, CQ CQ, then, "the 5A again". After a couple of repeats, he had me in the log. There was a small celebration within the confines of my shack.
So pick your battles, it isn't luck. Luck is where preparation meets opportunity. So keep looking for the opportunities.