It's actually a good scam that the WT has. They are getting pioneers excited to go to the SKE. Before the accept them, they make them agree to move where ever they are asked all on their own dime. When they graduate, they tell them where they want them to go and the pioneers go. It's like need-greaters, but the society gets to direct them like SPs without paying for them.
Many who graduated from the first classes (couples school) were upgraded to SPs, temp SPs, or temp COs. And even last years class graduates were told that after about 18 months they would either be upgraded to one of the above or be let loose to stay where they were assigned or return home.
I suspect that's why they feel comfortable letting all the SPs go. They have an almost free and endless supply of SPs that they don't have to pay for.