What percentage of bitcoin investors are gamblers ? Where will this figure be if we consider worldwide users ? I think it will be somewhere between 10-20% ? Also, it is possible that most of gamblers are still not bitcoin investors ? I see less chances of the later happening.
Probably because currently people who hold bitcoin can use their assets for investment, buying things supported the use of bitcoin and lastly is the use for gambling, for sure people who have this will get curious about gambling and try at least to make a deposits and try to make a game, even though they are not a active gambler still considered they are part of the gambling community with their experience.
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However, different case when it comes to gamblers as most of the gamblers are not into bitcoin investment. Some are just gambling for entertainment only, but I think for those who have been gambling regularly, they might have been engaging into investment, if not bitcoin, then most probably into other physical investments.
Once they see the use of bitcoin or crypto itself as can be used for entertainment and once they enjoy possible they will continuously do this kind of routine, and now its up to them if they treat this as part of their entertainment only or could be another investment for source of income.