This information is about my own personal experience as a member of IPMS.
I thought about joining IPMS for decades but never followed through. Then after 9/11 and all the negative realities that were a byproduct of this event, I decided that I needed to get on with something positive and attended my first local IPMS chapter meeting with a friend who was a member. I found a really welcoming community of really excellent modelers who were willing to take me under their wing and help me out with finding model kits and accessories.
Here are some random benefits I found from joining IPMS.
1) The IPMS chapter members get a discount on purchases at the local hobby shop
2) Access to inexpensive and hard to find kits through privately announced garage and estate sales and info on local modelling events
3) Participation in community events that the local IPMS was asked to sponsor such as make-and-takes
4) Attendance at local, regional and National model contests and I discovered the excitement and satisfaction of winning awards and recognition for my work
5) Finding a group of modelers to draw advice, recommendations and inspiration from
6) Development of a really close set of good friends who share a common interest
7) Field trips with a group of like-minded modelers to museums, airshows and other events.
8) My model building skills improved with advice and information from other members
9) An unexpected IPMS benefit was acquired from being elected the President of my local IPMS chapter several times where I gained experience and learned how to lead, manage, problem solve and inspire people which turned out to be an extremely valuable skills at my real job.
I strongly encourage you to attend a local chapter meeting a couple of times to see how you like it. If you don't and there's another local IPMS chapter, attend one of their meetings since each chapter has a different "flavor".
Speaking for myself, I have found that my association with IPMS has greatly enriched my life in general and recommend that you give it a try.