The way I see it, because so many new crypto currencies and tokens are being generated on new platforms almost weekly, the value of any individual one is being diluted.
Anyway, the extent of my strategy is to just power up until my votes actually show up on the score. (I've read that is around 100 sp) and not really an interest in selling anything unless there's both some reasonable value to justify the effort and a need that could not be filled otherwise.
It's prudent to have a variety of options.