If u are reading this, no worries on the frequency of joining in TS outings. I believe that wat matters is the effort to join. It doesnt matter whether u join regularly or on every single outings by TS. Understanding the various commitments of everyone of us, it is pretty difficult for anyone to join in every outings. CS or TS doest pay for ur time and salary. It's the passion of photography which brings everyone together. I believe that there are TSers who join in outings once in a blue moon due to their busy schedules. However, wats most impt is tat there's new and valued added experiences gained thru each outing. As mentioned by some TSers, TS restrict non-TSers from joining model shoots on their first outing. This is to prevent anyone from exploiting the models and/or simply joining for the sake of getting model shoots. By joining in non-model shoots first, it'll enable more understanding between newbies and the senior TSers. TS outings are as equally FUN and experiences gaining as compared to model shoots.
Juz my 2 cents. Hope I din say anything wrong in my above statement as I'm actually not a photographer, but a FRIEND of TANGSHOOTERS