First of all, nobody is 'the problem.' Please do NOT think that. This will happen to most bands and artists out there. They get older, don't do much or anything, and fans wonder how much there is to keep saying about them. Lurkers are always welcome!
I am not complaining that people here need to be more active. You're all using this the way you should be using it! It's just a question of cost. Peter used to give me stuff to auction, which took way too much time for me to set up, list, sell, ship, etc. But it paid for the forum. That hasn't happened for many years, and in fact, the last batch of stuff he sent me has been in a box in my storage for probably 12 years.
This forum costs me $1200 USD per year, and that's only because they were kind enough to keep me at the pricing I started with many many many years ago. Their new pricing is $1000/MONTH, and that would have shut us down (or moved us) immediately.
Making shirts means more time put in to design and handle those. My shirts on Redbubble make me around $4 per sale. So if I want to know that the next 2 years of the forum are paid, that's a lot of shirts to sell to get to $2400 in the bank.