It's a one-off opportunity, which was planned anyway but has been precipitated by the current situation. If my son says no, then we don't do it. If he agrees then comes back, he'd have to go on the waiting list (if we have one). The club need the right contact details for everyone attending games so even if you aren't planning to transfer your ST then you'll have to ensure your details are in order on the database.
The same situation exists at Liverpool and certainly used to at Old Trafford. Mate of mine (now sadly passed on) had something like 9 tickets which he rented out.