A user entering only 50 euro bills

[K3vin]

I discovered a user who is entering only 50 euro bills. Not a single other bill. Since it is not possible to contact him or her... What do you think, why? Is there a personal or practical reason or what could it be. Why and how does a person acquire only 50 euro bills and not any others. And by his/her hits it is possible to see that the bills have in fact been entered over a period, not just a whole bunch all at once.