Welcome Bruce! Hope you find what you like on the OTC! Definitely the wild west!
Wow.... that's a wide open question. I don't know that there is a common investment figure. But from $50 to $1,000 is probably the bottom end. From there on up to $10,000.
There aren't many trip 1's out there now.....but that would buy you between 500k and 10 mil shares.
In general terms on trips I go in with between a million on iffy tickers. 5 mil is probably my norm. 10 mil if I really like it. Then play with the numbers from there. Accumulating the movers and selling the non performers eventually. Learned a long time ago to keep a broad portfolio. Eventually it ideally becomes more about managing the money and risk moreso than managing the stocks. In my view anyway.
GLTU!
My comments and posts are my opinion only. I make no claims, nor represent any stock, trading tool or secret, etc. Each and every individual trader is responsible for their own trades and needs to make their own decisions. Best of Luck!