""3. the purpose of a base layer is to wick away moisture from to the outer layers, thus thinner is better ... if you want warmth ,,, wear a thicker insulating layer ... i see a lot of people buy thick merino and use it like a light sweater"
Sorry Eric, but i disagree with you.
The purpose of a baselayer is to feel comfortable next to skin.
I'm with Eric regarding the purpose of a baselayer. The whole point of it is to wick moisture away from your body and keep you dry. This is the generally accepted purpose of an inner layer by pretty much everyone. Look up any article on clothing layering and it'll say this. Example:
Some folk might prefer to feel cold and dry, i like to feel warm, and maybe damp.
No one has said anything about wanting to feel cold. You're misrepresenting others by framing this as a choice between cold & dry versus warm & maybe damp. Dry is warm. We all want to be as dry as possible and at a comfortable temperature. Synthetics allow me to be drier than I have been able to achieve with merino. I stay at a comfortable temperature using my other layers if need be.
"When you are done for the day you just pop the other [wool shirt] out and nod off and the wet one dries while you are sleeping."
I've never got a wet wool baselayer hanging in my shelter to dry overnight.
"Wool is exothermic, so it should keep you at whatever temp you are at"
BPL on this: "The discernible effect, if any, is mostly the comfort of the fabric against the skin. The actual heat generated is too small to have a significant warming effect for your body."