Not to me - as you can see from the sentence you quoted - but for the people being hired and in context of the other organisations that are offering them jobs.
For the people running an organisation the size and importance of wikipedia? 6 figures is a laughable minimum. The legal and social responsibility, the vast and varied expertise required, the personal social networks you put on the line. We need the best people in those jobs to keep that organisation existing at all, let alone functioning at the level is has and does. Recruiting those people is competing against the rest of the world to hire them, and they are already taking a huge cut in remuneration because they want to do good.
Depends on the market rate for their skills. In this case, yes, depending on where they will be expected to live a barely six digit salary could be low.
six digit salaries is small to you?