When someone starts to follow my shop, I always look at their profile and shop. I do not know what the protocol is on following, but I do not always follow back their shop. This is based on personal preference, but I am not sure if I am hurting myself by not following every one who follows me. Also, I do not have enough sales to make a judgement regarding what works best, so I have to say nothing I am doing is helping make any sales, but I am having fun, buying stuff, and learning. I have developing in me a sense of supporting fellow etsy shops by purchasing from them whenever I can, rather than a 'big' store, and everyone is very appreciative, but I do not think it helps sell my items.
I do not want to be on a team of nothing but card makers. I think that would defeat the purpose of teams.