...they have a life and are never in at the weekends.
All the better... you can occupy their houses without bothering 'em!
As for running up huge bills, that's not so common these days... haven't done that since crawling round the internet with a 14.4k dialup modem in 1998!
These days a contract with a fixed monthly fee is the norm... we pay £25 a month for ours (superfast broadband from Telewest).
You're getting closer and closer to the 100!