The fact that you are ringing the register puts you on a level most people never get to. People get conned into investing for a future they don't know. The following is fact not opinion. Any past profits or losses from a particular stock should have no bearing on exit or reentry. That profit or loss should only be considered in the size of future capital allocations. Market "losers" love to tell themselves that the money they lost was "only from profit anyway". A profit or loss is yours to own anytime proper liquidity is available. "if you can sell it you can spend it".
Concerning markets the issue is liquidity. The more liquidity the more viable the market in my mind. Markets that are too large can quite often be very efficient and have very worthy adversaries.The labels(NYSE,NAS,PINK) only come into play for myself when analyzing the perception of market participants. This plays into your next question. I like to sell when people think good news is a reason to hold for the future. If the market is able to absorb news properly it is in the PPS very quickly. A good example would be if MSLP did uplist and the PPS spiked I would likely unload a part of my position. I hope my answers help and not hurt at worst. I will look at your offering.
News 
Market Data 
Discover 
AI
