Take note that powered up posts are not liquid. You can't cash SP right away.
Also. We actually receive vests. Then vests are converted to SBD or SP. We're not receiving less. It's still at 50/50 value.
Ex: You got 100k vests. 10k vest = 3 SBD = 2 SP.
If it's 50/50. You get 15SBD + 10SP. It's not 10SBD + 10SP. You're not gonna lose any percentage regardless, they will convert it to the respective value.