The trading environment is very much like pennies in that the total size of the marketplace is miniscule.
Years ago I knew a couple of penny stock scammers, they liked nothing more than stocks with a small enough market capitalization they could pretty much buy and sell the total float. Load up, pump, dump into the resulting buying. Lather, rinse, repeat.
So, yeah, if you want to commit a relatively modest amount of capital, you could probably make things swing your way. Gosh, I wonder if anyone has tried this already?