Hi box2004,
There is so much misinformation in the mainstream industry and so many issues with mattresses that don’t hold up over time (especially with the major brands … see the guidelines here) that there are many people looking for reliable information about how to choose a mattress that they will sleep well on, that uses durable materials that will last, and that is a “good value” purchase. The lack of reliable information about mattresses are one of the biggest reasons I started the forum almost 5 years ago now (see here and here). Since mattresses are a blind purchase where the materials and components inside a mattress are mostly “invisible”, there are many people that are looking for reliable sources of “fact based” information that is outside of the “marketing stories” and claims that is the majority of the information they are exposed to when they are shopping for a mattress.
The sad reality is that those people that spend a couple of hours on this site will know more meaningful information about mattresses and mattress materials than the large majority of the salespeople that sell them in the mainstream industry and if you use the information on the site and in the tutorial then the odds are very much higher that you will end up purchasing a mattress that is a good “match” for you in terms of PPP (Posture and alignment, Pressure relief, and Personal preferences) that you will sleep well on … that uses durable materials that will last you for many years, that that will be good “value” compared to other mattresses that are similar.
There are certainly many people that aren’t active members of the forum after their purchase but there are also others that have subscribed to the topics they have posted and will come back to answer questions and there are also others that continue to post on a semi regular basis after they have made their purchase. There are also several “experts” that post on the forum on a fairly regular basis as well. Even with people that are no longer active members though one of the advantages of having a forum is that all the previous questions and answers are still available for others that have similar questions.
In any case … congratulations on your new mattress 
You certainly made a good quality/value choice and I hope you have the chance to share your comments and experience once you’ve received it and have had the chance to try it out.
Phoenix