Because the loss rate on OTC stocks exceeds 95%. For every 1 OTC stock with large gains, there are 50 with 100% losses. The only ones who consistently make money on OTC stocks are the toxic lenders and insiders. The average Joe investor is just donating to them.
"There's a sucker born every minute, 2 to take him and 4 to lend him toxic debt" PT Barnum's investment advisor.