Why the market price are rounded sometime ?

It happened really often that when i want to modify an advert to stay the first, both selling and buying advert, the price don't appear at the value i wanted to.

With small price it's ok, there will no rounding as far as i tried it. For exemple if someone sell Titanium at 19nic/unit, i will manage to put it at 18.99nic//units

But with high price, the rounding thing start to come.

For exemple, i put a buy order for a seth at 22 000 000 nic.
During the day, another guy put a buy order at 22 100 000 nic.
If i modify my advert to stay the first, and put 22 100 000.01 nic. It wil appear  on the market at 22 100 000 nic.

If i try with 22 100 000.50, it will be the same, the price will be rounded at the lower value.

I think it should be better to control the exact price of our market adverts, rounded price is not good for bizness

I hope i manage to make that understandable