My continuing tirade against Hotmail redux

Got this letter from a long lost friend:

Tried to send the link to the CIAC's website to everyone I know (I've gotten too much of this crap lately), and hotmail told me I have sent too many messages in the last 24 hours, so it won't let me send anymore (it cut off the last 20 or so people on my list)...

Why to we willingly let them do this to us?