I didn’t figure it out, I just agree with some points made on Telegram, check them out:
@jamaicoin: what happens in the stock market is a (20%) discount for current holders
@Stuart_James: @jamaicoin has a point, the thing is we’re quite restricted on how we can offer. You want to incentivize your holders with discounts for their support but at the same time, keep as equal a playing field for all. Keeping with the IICO ethos is our ideal scenario I guess but personally, I do feel supporters of the project should be rewarded where possible.
In corporate and equity world: https://en.wikipedia.org/wiki/Rights_issue
A rights issue or rights offer is a dividend of subscription rights to buy additional securities in a company made to the company’s existing security holders.
In startup and venture capital world - those who invested already - angel, seed, series A - have priority in subsequent rounds.
Proposal
Existing token holders participating in the 2nd round of sale will receive 10% bonus on the amount they buy. The amount eligible for the bonus is limited by 2x the existing balance.
The snapshot of the balance (block number) TBD. Avoiding drastic market moves
The incentive should be subtle. Thank you for the extra 10% but not remortgaging my house. Those who want to acquire extra 10% are unlikely to do massive shopping as that would increase the price and baseline of the sale, see the thread with exact pricing tiers: PNK minting and 2nd token sale - exact pricing tiers and numbers
Example
I own 200k PNK.
I purchase 500k PNK in the 2nd round sale.
400k PNK will be eligible for 10% bonus.
I will receive 500k PNK instantly, and the 40k PNK bonus after the sale is concluded.
Technical implementation
https://etherscan.io/token/0x93ed3fbe21207ec2e8f2d3c3de6e058cb73bc04d#readContract
balanceOfAt
It’s easy to tell what was my balance at any point in the past.
It is easier to implement bonus than discount.
Bonus can be sent after the sale is concluded.
Discount would have to be caculated during the sale.
Of course all the numbers (10%, up to double the amount) are arbitrary.