Those $150 bikes are perfect for restorations. If you are going to tear the bike down to the last nut and bolt anyway you want a cheap initial investment, though there are limits. Now a days everyone who has a rotting heap thinks they have a Sand Cast or 69 H1, and they are looking for telephone numbers. I just bought my latest project, a 76 550 in a little better shape than that GL for $650 and feel lucky to have found it. I would scoop up either of those $150 bikes in a second.