Not strange at all. There are several previously destaffed stations where ticketing facilities were reopened by independent providers and have been running successfully for years - Gobowen, Llandrindod, Newtown, Barmouth, Ludlow, Ledbury and Knighton immediately come to mind and I'm sure there are more.
It would be highly unlikely that a reopening like Kenilworth would be of the size and service level to have permanent staffing from the start - locals and councillors in Cannock lobbied for years without success, for example, for a ticket office, at least at peak times. So why not let someone else take the risk and offer an innovative or multi-purpose facility - tickets and teas together could just make the difference between a completely deserted station and one with a regular welcoming presence to reassure and encourage customers.