Last time it was possible to get about 10 times the amount in PNKS by just trading margin... Currently the margin is about 2.3-4.7 times the original amount.
Price range for buy orders is 0.000000200000 - 0.000000210000 XMR and for sell orders 0.000000500000 - 0.000000999999 depending on time of day.
There are times when a lot of traders make new orders and push the margin a lot smaller, so patience is important if you want to keep the profits on single round as high as possible. If you have lots of coins, it makes sense to eat the competing orders before making new orders as the gap between order prices often is enough to still make some profit.
Making too big orders on single price will scare the other traders away...
The exchange is quite small, so daily trading volume isn't high. On best days orders no more than 10000 PNKS get fulfilled.
DISCLAIMER: I have no affiliation with the owners of the exchange, but I do prefer exchanges with low deposit and trading fees.