As I said, I did the conversions in a year when I was unemployed.
(The best financial advice I ever got was to save up 6 months worth of living expenses. That was not so hard to do, once I decided to do it, and it has done *wonderful* things for my peace of mind and financial security.)
Also, in professions with large organizations where senior people set the salaries for everyone, they usually set their salaries high relative to others. Examples include attorneys in large firms, university professors, physicians in group practices or hospital networks, etc. Then there is the common pattern of moving up from general staff to management.
I am aware that in some professions the pattern is different, with the highest salaries expected in mid-career.
Think about it. The Roth costs more up front, which means more money is devoted to saving rather than being spent on coffee.
If Roth IRAs become taxable in future, I figure all financial bets are off, so no point worrying about it now.
Una