I personally feel that buying/selling/trading in the hobby is necessary and critical to the growth of the hobby in general. Not only do you have reef conservation (when selling/trading/gifting corals), but when you buy from someone that has a true passion for saltwater aquaria, you can almost bank on what you get (granted they are a stand-up person - we are all not created equal ). Look out for the vultures!!!
You also get to meet great people if you are buying/selling/trading in your local market too. I have met a great group of people through any combination of buying/selling/trading. I sell to supplement my spending habits (which I spend a lot on everything related to my habit, oh hobby ). Within my group, we primarily trade among-st each other and have a great group that if there is something (mainly equipment related) that the other needs, we still give each other some cash just because we have an understanding that all of this stuff cost $$$ (granted we do so at very reasonable prices). I think that if you have a group and people within your group need equipment (and I am not talking about just some junk you have laying around; I am talking about nice stuff here) you should give the person something for it (at least that is how I think). Whether that is trading something with them or just giving them some of their money back on what they spent goes a long way. That way no one feels like they are being taken advantage of. Coral is a different story. We trade and/or give that to each other and if someone looses a piece, we can just get them back that same piece.
When our group get together, it's not just all about reefing either (although we do talk about it). It is just getting to know each other and talking about life as a whole.
As far as giving to other hobbyist, I think the best thing that you can do is give them your knowledge (granted that isn't all but that to me is the most important) ;Bookworm. Let them know what you have had success with as well as what has failed (at least in your situation because everyone will have different mileage).
You also get to meet great people if you are buying/selling/trading in your local market too. I have met a great group of people through any combination of buying/selling/trading. I sell to supplement my spending habits (which I spend a lot on everything related to my habit, oh hobby ). Within my group, we primarily trade among-st each other and have a great group that if there is something (mainly equipment related) that the other needs, we still give each other some cash just because we have an understanding that all of this stuff cost $$$ (granted we do so at very reasonable prices). I think that if you have a group and people within your group need equipment (and I am not talking about just some junk you have laying around; I am talking about nice stuff here) you should give the person something for it (at least that is how I think). Whether that is trading something with them or just giving them some of their money back on what they spent goes a long way. That way no one feels like they are being taken advantage of. Coral is a different story. We trade and/or give that to each other and if someone looses a piece, we can just get them back that same piece.
When our group get together, it's not just all about reefing either (although we do talk about it). It is just getting to know each other and talking about life as a whole.
As far as giving to other hobbyist, I think the best thing that you can do is give them your knowledge (granted that isn't all but that to me is the most important) ;Bookworm. Let them know what you have had success with as well as what has failed (at least in your situation because everyone will have different mileage).