From their blog: “… members of the Priestly Fraternity of St. Peter [FSSP] do not take religious vows. However, at the priest’s ordination, he solemnly promises to obey his Ordinary, or Ecclesiastical Superior. For the FSSP priest this means he must obey his FSSP Superior in matters regarding the internal life and discipline of the Fraternity – and the Diocesan Bishop in other matters regarding the apostolate where he is assigned.
“Each member incardinated in the Priestly Fraternity of St. Peter also has a solemn obligation to preserve perpetual celibacy, the same as other priests in the Latin Rite of the Church. In addition, each member must strive to practice the spirit of poverty according to the Constitutions. Thus, the priest’s salary is quite modest, and he strives to live simply, detached from worldly comforts and possessions.”
In 2021, there were 526 members: 341 priests, 17 deacons (last step before ordination), and 168 seminarians. The priests are spread across 147 dioceses in Australia, Austria, Benin, Canada, Colombia, Czech Republic, France, Germany, Great Britain, Ireland, Italy, Mexico, Nigeria, Poland, Switzerland, the United States, and Viet Nam. The fraternity's membership represents 35 nationalities, and the average age is 38. The lay Confraternity of Saint Peter has over 8,000 members. We support the fraternity in a variety of ways.
The 168 will be in high demand as you can see by the spread. St. Stephen Sacramento is 1,500 strong. Math estimate - 1,500 x 147 = 221,026/526 = 420. That figure, one priest for 420 people, is on the low side and makes Francis' attempt to suppress and halt the spread of traditional orders evil.