My WAG of 1K was due to the guestimate of damp hand-to-lip resistance, since that's the most likely the situation for a guitar player. And you are correct that this resistance changes a lot depending on skin moisture. For example, with dry skin from finger-to-finger you can't feel a 9-volt battery, but touch that same battery to your tongue and it really hurts. Anything that breaks this dry skin barrier really lowers our basic resistance, and hence increases our fault current and potential electrocution. So I'll do some experimenting using both 1K and 2K meat puppet loads just for grins.
I tried sticking one lead of my ohmmeter in my mouth and the DCR still remains pretty high...
Wetting both hands with salt water gave me the lowest reading around 40k from hand to hand, so still lots of dry skin involved. Path is probably wet hand to core, and core to other wet hand. I suspect the dangerous combination is a full body sweat where there is a damp/wet path covering lots of surface area reducing the resistance into and out-of the lower resistance core.
Note: Core resistance varies too with how hydrated we are... while that is probably a secondary effect relative to surface salt water.
Have fun, maybe measure current with your RC shock blocker too.
Good advice, try not sweating or having open wounds while performing, or working around electricity.
Note: While perhaps not obvious this skin resistance varies somewhat with voltage, so higher voltage will measure lower resistance, and when skin gets damaged by high voltage, the resistance drops even lower. There is also a body capacitance effect affecting AC current, but the LF DCR should characterize it adequately for our inquiry (120v-60Hz).