Developers were very smart to price the IPO so high that it eliminates any potential short term pumping and dumping. Likely this won't occur and you need to hold the coin long term. This IPO is not for people that wants to make a quick buck and this should be posted in the OP.
But you can't prevent the miners from dumping
OK lets get some miner dumping numbers going to try and make a little sense of this.
Oh no! The price is now 350 sat!!
Why did you buy into the presale and sell at a loss?? At this price if everything gets dumped it is a whole 5 bitcoins a day.
There would have to be people not wanting to buy higher and people still willing to sell at a loss to stay at 350 sat.
Now lets look at the first 15 days as it currently stands.
At 518 sat over the first 15 days that is 114.45btc worth mined.
At 518 sat over the 45 days after that it is 171.45btc worth mined.
If people don't sell below 518 sat presale price then after 60 days 285.9btc worth of syscoin has been mined. If multiple exchanges can't absorb that because everyone doesn't want to support a working product then so be it. "Everyone" can buy in under presale price but good luck getting 5btc, 10btc, 25btc worth under presale price.