If you had raised the missing calendar in 2014 we would have sorted it for you. Certainly they all went out as its a massive task getting them all ready for posting and I did it that year so I know just how long it took! It's actually an eye opener when you send so much large mail out how much of it actually goes missing en route!
For some history, when I started MLOC it was all run from my own pocket, which became unsustainable over time. We then switched to a donation model which worked well to start with but the donations went away after the initial flurry. We then moved to advertisers to keep the site running which went well but generally internet advertising for banners seems to be on the demise with less people wanting to do so year on year.
In the mean time to become part of the MSA and have their insurances for events we needed to have MLOC as a limited company, the MSA rules mean we need to have members or we are not able to join them, thus the paid member was started.
Personally I would prefer not to have paid members as I prefer to let everyone have full access to the site and only rely on advertisers to keep the site running. That's why there are limited member benefits as I set it up originally so that everyone could post as many photos as they wanted or send as many messages as they wanted for example, not just paid up members as other sites do. The price has been kept low at £1 a month for that reason.
In terms of money made on previous years from the members signing up its pretty minimal once we have paid out for the calendars and postage which keep increasing in price every year. The main reason for membership is to allow us to keep the MSA membership going and it does also help contribute to the sites finances, all time and effort is given for free by everyone so no one is taking any money personally from the site, no mileage expenses or anything like that. More recently now that we have equipment purchased the LITP events have been making money and thus enabled us to allow donations to charity after we have made a small profit towards running MLOC.