I don't think you can impose a requirement for individuals to be on this thread. Not everyone has the time that permits them to spend lots of time on here. Just because they to do not post messages, does not mean they did not read the thread. There are also some who do not like to post or may not have photo capability, although a PM to the person in charge of the swap or their SP would be the courteous thing to do.
I believe Suzanne was removing those who do not send to their SPs from future swaps. We all have things going on in our lives from time to time. I have forgotten to post to the board a couple of times, but have sent PMs as soon as I could.
I will be moving to my little farm in the next week or so. I do not have electric or internet so my posting will be limited to when I am at my monthly Guild meeting which is 45 miles from my new home at which time I take my laptop. This does not mean I should not be permitted to participate in the SP Swap, it just means I may have to wait a couple of weeks or so before posting. Electric and internet are not my No. 1 priorities at the moment. I have a cabin to finish before these items move up the priority list.
I like to see my SP post as much as anyone else, but I also understand that it may not always be possible for them to do so within my timeframe.
Also, my packages go out later in the month than some others do, but they do arrive before the end of the month.