Where do you get the idea that they will all need subsidising?
A refugee who lived near me for a while is working as a psychiatrist in the NHS, a refugee friend runs the education programme for a local museum, when I had a plumbing emergency, the plumber who came and fixed it had come here as a refugee.
I've met loads of refugees who work and don't claim a penny from the state.
If we let asylum seekers work while they're awaiting asylum decisions, the tax they pay would offset some of the costs, but then people like you would be bleating that they're coming over here, takiing our jobs.