Its nice to split up the bitcoins into separate wallets.
What is so nice about it ? Logically speaking,the reason I use multiple wallets is to be secure just in case but mostly for my transactions/Savings.I maintain an online wallet for my daily transactions while whatever I earn through gambling or promos I save it in a offline wallet as cold storage (security funds).Besides this,its a good habit to use distributed systems as a way for securing accounts.
agree maybe if something happens to your wallet like hacked, of course if you only have one wallet all your money can be lost, be different if you have a lot of wallets,