Why do they only want to give you a share when they're revenue-neutral?
A limited company, their liability is extremely limited, I'm assuming it's not a partnership. There's no reason for them not to give you equity right now.
From what they said was that to give out shares at this point would require additional lawyer fees. They are already formed as an S corp (I believe), so I'm not sure how much lawyer fees would be required, but nevertheless, I was young and naive when I first started (this is my first startup) and probably should have pushed a bit harder.
The truth is that they might actually believe that they'll give you a "big slice of the pie" once the money starts rolling in but in reality what will happen is that they'll a) get greedy and b) be able to afford someone(+) to replace you if you complain too much.
It's just aaahhh business and you're out of a job with no pie.
Vacations needn't be expensive. Sure, there's a loss of one week's income generation, but it's possible to have a fantastic week away on what it would cost to talk to a lawyer for half an hour. Some examples: camping and fishing, eating what you catch to save on food; rock climbing; backpacking; etc.