Well what about Bitcoin? Satoshi has 1 000 000 of them and many of the other early adopters have enough to make a big drop and play with the market and it is happening right NOW if you pay attention on the Coinmarketcap and the bitcoin market is HUGE comparing to ours.
Solarcoins had a fair launch at the beginning so I don't see the problem here. The beauty of the solarcoins is that they must be CLAIMED and the total solarcoins that people like me and others have around the world at the moment is less than 1% of the total amount of coins that will ever exist. In every coin there are big whales, but here if the IDEA of the coin and the POS system works exactly like it is supposed to be, I don't think someone will be that stupid to sell off just like that, because he can easily make money only from STAKING. Lets say that at some point the price of 1 Solarcoin go over 10$ - a person with a fair amount of coins can make 50$ or more a day and every other day just by staking his coins and do nothing. Even then if someone of those 50 people that you mentioned decides to sell out and make a big buck, he will probably sell ~0.1% of the total number of the coins that will ever exist, so even then, he WONT make a big difference since by that time, many new people will be interested in the coins and the market will expand, just like the bitcoin one did. Speculations will always be a part of our market or even ANY market in the world - it is just how it is and no one can change it.
SO my advice is - BUY THEM WHILE THEY ARE CHEAP