and have asked me about it.  I've told them about TER and how it works.  But they have all stayed on SA and to the best of my knowledge have not transitioned to TER.  One SB I dated for a while did transition to TER, but she was not one I had discussed it with.

Is one of the reasons they don't switch over to escorting. At least that's been what I heard from the SBs I've has arrangements with.  
Most SBs I know do this just to bridge an income to expense gap.

I have a SB that I met when she was escorting after Christmas and did it to catch up on bills and bridge her until her divorce was final.  She got back on her feet in about 6 weeks and stopped working.  We stayed in touch and turns out we live like 10 minutes from each other (both very remote) and see each other weekly.  I'm decent looking and in good shape and she always tells me she love spending time with me.  I know she has another SD or two in her mix but said she likes the fact she gets to choose who she sees vs the surprise client when the door opens.   She said she really did not like being an escort and loves being a SB.  BTW she is a true unicorn and had 9/9's for reviews and I give her a 9/10.  Kinky as hell and has never said no to anything  Sure love to find another unicorn or two and am still looking.