The added value of the fix is in the upper 8 figures due to enormously reducing friction for players. If a consultancy was hired to fix the performance problem

The added value of the fix is in the upper 8 figures due to enormously reducing friction for players. If a consultancy was hired to fix the performance problem the cost would run over $1M. $10k is funny money to Rockstar. In normal people's terms, if somebody did hours of labor that gained you >$10k, would you give them $10? That would be insulting, yet that's what Rockstar did.