For the $10k guy, it can come down to choosing which necessities to cut back; for the $1M guy it may cause second thoughts about that extra week in Europe or Aspen.
Sorry that doesn’t wash. If you are making 1,000,000 or 10,000, a percentage is a percentage. Let’s leave class warfare to the Democrats, 10% of ones income is fair for everyone. Otherwise it would seem you are advocating a “from each according to his ability, to each according to his need” type of system.