I don't consider '70s cards to be vintage, but if a deal presents itself and said '70s card is enticing as well I'll gladly plunk down my hard-earned money for some nearly vintage cardboard. Such was the case when I realized that Davey Lopes' 1973 Topps RC is a tougher card than I thought it was.
We got in a copy at work and after throwing it online I learned it was our only one and, as I mentioned, tougher than I thought due to it being a high number. That being said, it was still an inexpensive card. For about a buck, it was an easy add.