I also rarely, if ever, join PF'er's these days for this reason.

And actually, when i do join PF'er's, I usually find myself specifically joining learning parties over any other. For me, it's all about what expectations are being set in the description. All too often I end up in farm parties with players trying to ninja a win. Usually clear parties play similarly to farm parties, except it's players who HAVE cleared that turn it into a wipe-fest. In other words, the expectation is not being met. So I leave. Learning parties, on the other hand, wipes are part of the expectation. I find it farm more rewarding helping a group of players learn and progress than helping 1 or 2 players clear content as part of a group of vets anyway. And then, of course, when i want to farm something i usually just try to convince my static to do it.

TL;DR: Don't give up on the learning parties, and if you can, try to find static members for the future! It makes the game so much funner. Really.