Ha!
Actually, I did it for two reasons:
1) I haven't watched TV since the NHL and NBA playoffs ended.
2) I really only watch sports and couldn't justify paying $150/month for cable and internet. Now I'm just paying $50 for internet.
As for the modem rental, it's worth the $10/month to not have to deal with the aggravation of having my own modem and router. Earlier this year, they upgraded my area's internet service; they provided a new modem to accommodate it, so that was a savings over having to buy a new modem and router myself.