OTC is low risk high reward. If I invest 1000 bucks and come out with 100,000 then it's a good ratio. If I invest 100,000 bucks and come out with 1000 (as many do in the NASDAQ/NYSE/etc. if they win) then it's a huge risk.
Company's do move from pinks to other markets, but first they move up in the OTC. From pinks to BB or QB and then on to NASDAQ or NYSE. IF you do the research you will learn.