Status update:
Our bankroll shares program works almost perfectly.
There addition of new shares is slow enough to be sustainable. The 8% (@100 shares) fee seems to do the job as expected.
The only tiny issue is the share price - it is very high, currently at 170%. While that is a bonus for the larger investor, it makes it difficult for small investors to buy shares.
Anyway, the whole shares program is already a huge success and we are looking forward to the future development of it.