If all you are after is to blow your load, a quick wank is undeniably more cost-effective than a 15 or 30 minute quickie. However, for me at least, I am after more, much more, than that. Nothing beats a long, leisurely, intimate session with a regular. Unfortunately where I live, out in the boonies, an impulse punt is not on the cards, so often a wank is my only recourse if the sap is rising.
Looking back at the OP, I think it is a bit unrealistic to expect much of a connection with a total stranger in a one-off 30 minute punt. You either need a longer punt, or to build up that connection over several visits. However, if that kind of connection is what you are after, you sure aren't going to get it from a wank!
The problem with wanking to porn is that it can build up unrealistic expectations, that real life is never going to match.