Am i mistaken in thinking there is an issue with some people investing hundreds of dollars into video cards to create basements full of mining computers
Mining is both necessary and self-limiting. Too much mining power will make it unprofitable for all but the few, and that may be an issue, but the early adopter problem is an issue regardless. It is a natural system and will balance itself out.
interfering with both the value of Bitcoins
It most likely does not.
and of graphics cards?
This is certainly an issue for people who just want an old video card, but regarding mining, see my first point.