Can't say how rare those particular cans are that you've posted, but can say that I have seen many cans sell for double those prices in recent months. I have an O'Neil's Velvet rocker for sale on eBay right now and it's already at $260.00 after two days with 6 different bidders on it including yourself Maverick.
Item number: 261081757359
I just checked and it looks like one bidder on my can is also bidding on the other cans you have listed. They have (55) positive feed backs and I just checked his buying history which does appear to be a legit collector. They've been buying vintage rocker cans, and glass quart bottles in recent months and appears to be on a roll. I'm thinking there's nothing to read into there and if you want to collect rocker cans, you're safe to bid what you're comfortable paying for them. Rocker cans are quite collectible, and some are considered to be very rare indeed. I've seen them as high as 800.00 for the rare mint condition cans and average 300.00 to 500.00 for some others. If you see them under that and they're an uncommon can, best be jumping on it as their only going to increase in value is my opinion of 80 year old cans. Lots of luck to you in either case.
Last edited by GasCan; Tue Aug 14 2012 06:40 AM.