Same as NEXT then. It is a problem because small investors will get minimal benefits from bergstake.
Over a long enough time, they will get a benefit proportional to their investment.
the other option is to provide an interest rate on all bergstake instead of a block reward system...
That would be much better IMO. But where does the interest come from?
One way to work this idea is to require a minimum share for Bergstake, equivalent to say $25 at ICO prices. That's higher than the minimum ICO investment, but it isn't going to break anyone who has spare money to invest in an ICO.
[edit]"Interest" would be a constant payout per block times the stake multiplier, is how I understand it.