I applaud the focus. I am just not sure that the mode is the best way to do that. There is something compelling about "the income that the most people make". But I think "the income that is right in the middle of what everyone makes" has a slight edge for me in this respect. Anyway, it's a good thing to focus on, regardless of the metric chosen.
After another day, I think I realize my issue with using the mode.
The actual mode is going to be a single number, not a range, and it will correspond to very few people's incomes. To be usable in the way you mean, you need to add a range to it, and the size of that range is up for debate (mode +/- 1000? 2000? 10,000 ? etc)