Why making a simple action complicated? Why do we need to put our Bitcoin to a smart contract where in fact we can hold it ourselves?
People selling their Bitcoins for some reasons. Some are selling it because they want to buy stuff. Some just felt that it the perfect time for them to sell etc. For me as a Bitcoin holder, I don't think this coin is necessary or useful for me because I can hold my Bitcoin myself.

Holding Bitcoins is very easy. Its just the fact that their emotions are the problem thus, some are selling their holdings at a wrong time for them.