Our token will receive regular rewards which means people who hold the coin will benefit. With normal utility coins people will only gain when they say. We therefore do not anticipate dumping.
Regarding the bonus, this is open to everyone and not just whales. In most projects they just do this kind of bonus secretly (private sale), or in presale. We believe in doing this in public and letting everyone participate.
If whales get up to 50% discount, I think you can expect a big price drop once the token will be traded on an exchanges.