There are a lot of members out there that don't post here for several reasons.
I too dedicated myself more than 10 years ago, only recently I've decided to be active here. Just because I wasn't posting or replying, that doesn't mean that I wasn't reading the sermons and the problems of the members. I was cheering them all at the background, asking for the Gods to help. Every year I was doing a Sun Square, I've managed to do a Moon Square once but that was really exhausting. I got excited every time a new ritual was released. A lot of High Priestess Lydia's posts helped me, her yoga position recommendations for the chakras I still use today

. I was so proud when HP Hooded Cobra (now HP Zevios Metathronos) posted his sermons, it made me feel "this is my High Priest!

", what a good thing to have him in the community

.
There were many moments that I wanted to say something, but I was dealing with heavy transits (a lot of them lasted for years

) and the infamous Saturn return. There was a lot of work for me to do, so much healing, freeing the soul, and the fear of the community not accepting me. After bad experiences with groups in my life, I've felt that this was the last and most important place that I wanted to belong. In my mind if I wasn't accepted here, then I wouldn't belong anywhere. I would've given up and decided to be a loner. Not that people out there are bad, it's just that there's something missing in them, there is no other place to truly seek spiritual knowledge in the world. Even if I get into academic knowledge, it is mostly shown as superficial, presented as what is useful and what isn't, and there are few people that actually digs into more profound topics. The usual is to put everything separated in boxes and barely make a connection between them.
But even if I got sick or something, I trusted my brothers and sisters whenever I couldn't participate with them in the rituals. I know that if I wasn't available, there would be someone to help in my place. And if eventually I was available, I would be helping in place of someone that couldn't help at that moment. Even if we don't know ourselves face to face, there is a lot of trust placed between us, we're all working together in great union to make a significant change to this world.
I think it is just like being in a coven or a lone practitioner. Some people like to be in groups, others prefer to be with themselves.
Some members might have problems with communication (just like me), others could be paranoid, have social anxiety, whatever. There can be minors afraid of their strict parents finding out about them. There can be places in the world with bad internet connection, susceptible to blackouts, warzones. Some people can have their phone shared with the rest of the family (that happens a lot with the poor people). Others could be living in a strict political regime in a country, with the government monitoring everything that they seen online. Some old member could have said something stupid in the past and is embarrassed of returning here. Others not active anymore might be busy working on themselves. There are people that just don't like to talk much. There are a lot of cases to consider.
As a side note, after starting to get active, I only post here using my computer at home, but I've read everything on my phone at daytime. When I'm not home, I just have my cellphone. For security reasons, I don't like to enter here through my phone.