Few people thought 1Time would survive more than a few months. They've lasted about 8 years, so I would guess they're doing their sums right, as they don't seem to have unlimited backing like the orange lot and the green lot.
I've never flown 1Time as I have reasons for preferring SAA and Mango, but there does need to be competition and I would be very sorry indeed to see 1Time go. Good luck to them.