There have to be sellers and buyers for the share price to go up. What we need is for those with tons of shares, like me, to not hurt the share price by selling too many at a time, or by selling at market, the worst possible way to sell.
I'm quite content to sell shares when the price is moving up. But you'd never be able to detect when it is happening, because I won't hurt the share price. I want it to go up as much as anyone.