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.
There's no reliable statistics of crypto gamblers who are Bitcoin investors but we know that every crypto gambler in one way or the other must have transacted using Bitcoin but still it doesn't make them investors in Bitcoin but it's very possible for an investor to be a gambler.
Not every investor is a Gambler. Most investors especially high profile investors keep their assets in cold storage wallets where they have limited access to their assets probably because it was ment for the long term investment hence they will not be able to gamble with it, and their has been no official collation platform who can provide an exact statistics of Bitcoin investors who are gamblers and those who are not so your question at the moment have no straight answer.