Why do they bother to do $10 $20 $50 trades in companies like...

Why do they bother to do $10 $20 $50 trades in companies like CDU anyway ? Why not make it $500 like the minimum trade is for the VAST MAJORITY of traders, then they can blaze away all they like, and they should also pay full brokerage on each trade just like i do. And imagine the impact those tiny trades have on illiqiud penny stocks like VHL ARO and hundreds of others, i have seen a share trade one day at 6 cents, the next trade was 5.2 cents on a $5 trade i kid you not, you reckon that's legit ? The whole issue here is the uneven playing field, the big boys at minimum cost can manipulate prices up and down to their hearts content knowing they can do so for next to no brokerage, and no action from ASX or ASIC who actually ENCOURAGE this fraudulent activity, see 2001 corporations act CORPORATIONS ACT 2001 - SECT 1041C False trading and market rigging--artificially maintaining etc. trading price. If a corporate lawyer exists that actually takes up the fight for someone who's been on the receiving end of this botulism disease, ASX and ASIC will have the rear end sued off them, not to mention the possibility of a jail cell if collusion is proved. After all, Bernie Made-off was once the Nasdaq chairman...dont think it cant happen.