Small investors are skeptical of the market’s future, and public 'interest in over-the-counter issues [continues to be quite limited, says Walter Mintz of Shearson. Ham-mill Co.Me suggests that the lack ofI participation can probably be ;traced to two basic factors: —Many small investors suffered heavy losses in high speculative securities—particularly in over-thp.r»nnntor —Htirina 10A9 i