However every project's balance is stored in your coffers, correct ? And you use an exponential decay function to distribute tips (1% of the balance per commit), which means that some fraction of the donated amount will always remain in your possession, correct ? And statistically, a majority of projects will slow down or stop development altogether eventually, and in this case you will keep the bitcoins indefinitely, correct ?

Could you provide an estimate of the amount of tips actually sent to people with regards to the amount donated ? Could you also provide an estimate of how much funds are being withheld because the tips amount is below the withdrawal threshold ?