I would bet that this player gets tips for a living. Bigger deposits may be near paydays.
Could also be a hubby and wife. We can only guess which deposits were made for who.
I have seen my wife play at amigobingo (ALOT) with similar deposits. She claims that she basically maximizes the bonus available, and deposits accordingly. She once deposited $200 and recieved $1650 in credit plus 2 trip vouchers for a week in Vegas and Orlando. She managed to get it to $1000 ahead. She gave up over $1000 bonus and cashed out 800 up. Her amazing bingo bonus skills would make us a fortune if ‘We‘ could just avaid all forms of black-jack lol.