We seem to have hit on a magic formula.
Home shirt - fairly traditional rugby shirt, alternating the main colour red/white/blue on a 3-year cycle. Most will buy this, particularly older end/traditionalists. And sufficiently different to buy one each year.
Away shirt - a bit different/ casual sportswear, probably aimed at the younger end / those with more disposable income who want 2 shirts.
Replica shirts exist to make money for the club.
The other merchandise has come on by leaps and bounds under the current regime for quality/design and delivery/availability.
It's not long since obtaining club merchandise was really difficult and was limited in variety and really poor quality. (and it had a cartoon cat on it
)