Once a couple are paying for their wedding, they should be calling the shots. When I married, every guest was personally known to us, I didn't invite cousins I hadn't seen in years and left some other relatives out. Regarding costs, we stuck to a reasonable budget, bought invites, did booklets ourselves, flowers in market, vintage car, photographer threw in his merc for transport. Only real extravagance was the nice cake at about €500, dunno how/why wedding cakes can be so dear. Can you eat a tier after 6 years?!!
Been to a friend's wedding where groom's parents picked his guests, a lot of their friends invited and mainly because they were invited to friends' offsprings' weddings. Noticeably older guest at the wedding and of course a lot of them fecked home early once music started.
I attended a wedding where the groom's parents didn't attend ceremony or reception as they didn't agree with the family guestlist.
My elderly mother in law was invited to a niece's wedding, the invite was just for her, she was seated at a table of strangers! After the meal my wife collected her from the ordeal.
A bride I know invited her estranged brother (the bride's brother) at the mother's insistence. Needless to say a no show, no card or gift obviously.