I did....but there's no explanation as to how that affects your % of bankroll.

A slightly more technical detail on how this works, if you're interested.

The site has an actual and a virtual bankroll, and you have an actual and a virtual investment.

The sites actual bankroll is around 140Btc, but your 0.5Btc investment is around 0.03% of the bankroll. Assuming you're using 1% kelly, this makes the virtual bankroll of the site 1650 (this shows your numbers are very much rounded btw). Calculated with some more accurate numbers, the virtual bankroll is around 1383.59Btc This means that the average kelly of the investors is around 9.8%.

So, when you invest 1 Btc at 1% kelly, you raise the actual bankroill and virtual bankroll with 1Btc (Actual investment: 1Btc, Virtual Investment: 1Btc). This would make your percentage of the investment around 0.072% (1/1384.59*100). This means that for every bet won by a player, you pay 0.072% of his winnings, and for every bet lost by a player, you receive 0.072% of his loss (0.00072 to the Btc).

But now you raise your kelly to 5%. This means that your investment in the actual bankroll is only 1Btc, but in the virtual bankroll it's 5Btc (Actual investment: 1Btc, Virtual Investment: 5Btc). This raises your % to 0.36% (5/1388.59*100), This means that for every bet won by a player, you pay 0.36% of his winnings, and for every bet lost by a player, you receive 0.36% of his loss (0.0036 to the Btc).

As you can plainly see, Increasing your kelly % increases your "winnings" from investments, but it also increases the amount you pay when someone wins, in otherwords, increases your chance of being ruined by a high roller.

Edit: Also

Any chance you can add an affiliates call to the api that returns the number of affiliates, amount wagered and amount earned for the logged in user?