Low and mid-grade universal Cap1s have been largely absent from the market over the lat two years, at least on the Internet. I just checked GPA and there is only one low/mid grade universal sale in the last two years: May 2015, which was 77.6k for a 5.5. Two years is a long time ago. So, it's hard to get a bead on price.
C-Link has a Universal 2.5 at 95k that has been sitting for a little while. http://www.comiclink.com/itemdetail.asp?back=%2Fsearch.asp%3Fwhere%3Dsell%26title%3DCAPTAIN%2BAMERICA%2BCOMICS%2B1%26ItemType%3DCB&id=1143234 So, 40k per point might be a little high for buyers now. I'll say 30-35k. Two or three years ago books in the 6.0 range were selling for ~ 100k. Would a 3.0 fetch 100k+ today at auction? I agree with you and Gotham Kid. It's tricky to figure out ppp for Cap 1.