Each rest is worth X amount watching videos. At my level it's 125 thousand.
Spending 60 rests would be worth 7.5 million worth of rests, about half of what you pay for a top nordegen at my level.
I highly doubt that any amount of SA/positions would increase the sellability by my than 500. However spending 60 rests on his training would add about 3 million worth of value.
Training to sell, is never worth it in my experience. Just do cash packs instead of rest packs. Though it may change at high levels, I hear that a lot of the higher players have billions left over.