I don't think its bad etiquette to ask about lures/presentations but as others have said, being polite and genuine is the key. Sometimes I ask and if someone asks me, Ill give them all the info I can. As long as they're not trying to fish right on top of me, I have no problem with it. I can recall 2 situations where information was offered to me without me even asking asking. The first was my very first time bass fishing. I was on a dam and throwing a t-rigged worm and this old guy that was crappie fishing comes over and starts talking to me. "Catching anything? How long you been fishing? I caught a couple last week on a t-rig. That's a good color worm. Work it like this. Try casting it over there". Dude gave me a little 15 minute seminar on the t-rig. A short while later, I caught 3 within about a 45 minutes. Another time on the same dam I was fishing a crankbait with no luck. There were these 2 guys trout fishing on the other side and one of them pulled in a 2lb bass. The guy holds it up to me and shouts out "Caught him on a white roostertail!". I tied one on and immediately start catching em. These 2 experiences really stuck with me. So I'm more than happy to share my fishing knowledge (the little that I have) and I'd even be willing to share some soft plastics with the right kind of person. Hard baits, I dunno. I'd like to be able to but moneys tight and lures are a bit to pricey to be giving away.