This morning I was browsing stamps on e-Bay and encountered a pair of very high priced stamps that look to me to be ordinary booklet stamps from 1926 - Scott nos. 632 & 634 - pictured below. The 1¢ Franklin was priced at $4999.99 and the 2¢ Washington at $2000.00. Each, from different sellers, didn't list a catalog number but used the words "green line" and "red line" in the description.
Does that green and red line on the stamps actually make them worth $2k & $5k, or are the sellers just greedy fools?