My DD and FSIL have made the decision to have a cash bar at their wedding reception. Based on what I have read on this forum I realize that most people frown on this. I tend to agree with this. However, having said this, in the region I live in, and where the wedding will be held, cash bars are the norm. The owners of the wedding venue have said that all weddings held there are cash bars with a few exceptions having the cocktail hour as open bar. Most weddings we have attended in this area have been cash bars.
In my extended family (not my husband's) open bars are the norm and since my extended family is very small, but coming from quite a distance, my husband and I thought we might buy their drinks for them. We would try and do this on the QT (although we would discuss this first with my DD and FSIL), but were wondering if we would be creating another breach in etiquette.
It is not specifically financial reasons that they are opting for a cash bar. Apparently there are some family members on the groom's side that have a problem with over-indulging which would lead them to conducting themselves in an appropriate manner.
Bar prices are very reasonable and there is no difference in prices between beer, wine and basic alcoholic drinks with mix. We are already paying for a significant portion of the wedding expenses which don't include the bar.