100%. We don’t have anything until we sell. Even if we have success at hand, it will be a very bumpy ride with many pitfalls on the way. Remember Dendreon. Shit happens.
My advice, for exactly this reason, is develop a plan. Write your plan down. Keep a core amount that you want to carry til the end. Sell at set prices (you may be able to buy them back on a pull back and resell). Nobody ever went broke taking profits. Though I believe this is the real deal. You’ve got to be practical here.