Maybe I'm lucky by living with my girlfriend and brother. Neither of them would drink my HB if I didn't want them to or just asked. Not that I do, they actually both pay for batches every once in a while to ease the burden of cost.
Can you just try asking your roomates nicely to contribute if they want to drink?
Primary:IPA, Belgian Dark Strong Ale
Enjoying: Gumball Head, Belgian Wit
In the Works: