Yes, the forum influences my purchases but in the opposite way as the original poster intended. I have bought less new equipment after reading stories here. For example, I am a big Hudson fan and was going to buy a PS3 Dreyfus Hudson. After reading that Lee's was DOA, I didn't. I also like the Lionel Berks, but after seeing the wheels falling out of the front axles on member's locos, I didn't.
I certainly don't blame or fault those who purchase these items. And I understand that in many instances the number of respondents here to a "thread" with a particular problem is not a large sample size. I am also willing to acknowledge that some of the issues reported here aren't that serious (by definition I guess there are no "serious" issues with trains).
That being said, it is my experience that the people on this forum are a pretty knowledgeable group when it comes to O gauge trains, and if they are having issues, and given the frequency that quality issues come up on this board, then it is not a random thing -- it is my view that there is a significant quality problem within the O gauge hobby today, impacting all of the major manufacturers -- Lionel, MTH, and WBB. I have given up trying to figure out why, or blame a particular reason, but I can control my dollars until it is my view that the issues are fixed.
I hope they fix these issues, because I think the products have great promise. It's just that for me, I find that like many people I have very limited time that belongs to me -- my wife and I are in our prime earning/working years, and we have two kids. I love O gauge trains, and likely always will, but I cannot allocate time to buying and running newer trains given the prevalence of problems -- it turns what typically is a relaxing and fun hobby into one where I feel foolish for buying myself or the kids something that in too many instances is broken out of the box or within a short time thereafter.
As to warranties, certainly I understand that the manufacturers are reputable in the sense that they will fix the problems, but I don't view warranties as a remedy for shoddy or sub-par quality, or a means to impose final quality control at the cost of the consumer's time or expectations. So as a point of principle I don't like to buy things that don't work -- life is too short and I don't spend money in order to aggravate myself. I am also a free market type so I believe in market discipline, so I have to impose a bit of my own here.
That's a long way of saying that this forum provides invaluable information, and is terrific at spurring additional interest in the hobby. But I have opted out of the latest and greatest craze until I see less in the way of these quality issues, whether it be boards, tethers, sensors, smoke units or anything else for that matter.