> I have a passion

Do the passion part of the time...
Do the thing you can make money part of the
time...
Find ways to reduce your expenditures(which
YOU can live with)

Use Dien's suggestion of finding a way to
accomplish more in less time ....

> Do you think people should insist on their
> passion and their purpose being the same
> thing?

No...not necessarily...if you can combine it
it's ideal but not necessary...

note at the water site how it came about:
the main purpose of the website owner is to
get the word out about water but his love
is fixing cars...he uses his business to promote
his mission when he can...

it's taken his toll on his family life which is unfortunate which is why I'm suggesting a way to find BALANCE between the two and eliminate non priority items and time wasters(you can live with)
in your life ...