i do no think htere is ny consideration in asking or manating a bounty hunter to have a specific amount of exchanger account as it solely depends on the individual who happens to be the hunter in this cases. again, you are always required to have accounts in exchangers, whether or not you are a bounty hunter, if you must exchange your token.

I just believe to one or two exchange to store my asset, because it will make me confuse to have many exchanges. I just pick two exchanges who based outside in my country I mean some exchanges who didn't accept money fiat directly to make deposit such as binance excahnge and just one exchange that accept my money fiat directly and usually this exchange just popular in each country such as Indodax.

As for to store an altcoin who still haven't launch yet to the exchange I just choose MEW to store them. And I'll wait the token/coin being listed on the popular exchange such as binance to sell them. That is my strategy, Indeed having a lot of exchange account is good for arbitration strategy especially if you are a trader but I just decided to choose long term investor and I forget it.