Those are nice frames at a fantastic price. Any one is worth $30 by itself. I'd buy them. In my case I might find a cheap yard sale bike with a trashed frame and transfer parts to the new frame.

The earlier posters are correct. It would be hard to get your money or a profit out of building bikes from scratch. I have built a few modern (ish) bikes from scratch using a mixture of new and used parts. They cost from $400 to $800 and usually bring a profit of $0 to $150. Many times it's only a means to get money out of surplus parts from earlier trades/sales. It also takes more hours to accumulate, build, and sell than a normal overhaul and flip. I tend to buy extra parts on sale ($15 drop bars, $12 headsets, $5 chains, and $9 tires) and pick up Craigslist parts for way below retail prices.

I often wonder why I bother - though most of the bikes are my size and I do ride them a few times. I do like trying out a new or interesting frameset. I've also put a number of coworkers into bikes.