Investing thru trading and time keeping the bitcoin is one fantastic way to invest using bitcoin.  Running the business in solo or with a partner is a better way to have faster growth in terms of profit. But it is most better to have a team in order to keep a focused operation on a specific scope so as not to waste time in the different aspects of the bitcoin industry where in trading is not the only thing that we need to be serious with.  We have to keep every individual doing scopes under a supervision or management for the whole operating team.  Three or more could be ok depending also on the kind of load of scope.