Since Chester is unlikely to ever usurp LPL or MAN for business traffic, it will need to generate its own, and my guess is that it won't generate much business (high revenue) traffic, specially if the flights are not at least on a daily rotation. On that basis, it's going to have to look at leisure traffic primarily and as it's very much on the tourist map there seems to be potential for services to/from other tourist rich destinations such as Paris, Edinburgh and Amsterdam.
I am in the process of obtaining some numbers.