Presumably you can collect some money from your guest to cover the cost of the ticket? What about a guest you found through a website? perhaps with some added 'fees' for being helpful etc...
I know... it's probably mentioned in the small print etc... but it is all a bit nebulous.
That said...
Many of our home games go to 'members guests' (in fact all on sale at the moment... Ajax, Fulham , Sheff Utd, Brentford, Burnley & Marseille)... so I can't see why this is a problem - other than the STH/Albino+ taking responsibility for what their 'guests' get up to. Although there are probably...