Describing donating a pint of blood every several weeks as “regular bloodletting” is really something. I mean I guess in a literal sense that is what is happening, but they literally will not take your blood if it is not safe to do so, including donating too recently.

Edit: by the way, after thinking about this for only a few moments longer, i have realized you can probably do even better just by donating plasma only, and now you are not even losing your blood cells.