You are wise to be skeptical of the rug's "retail price". It appears to be Indian, not that it has severe impact on value, but that may be some indication of improper id.
Retail brand new these rugs can cost a fair amount of money, however, lightly used in a second hand situation for a carpet that has relatively no information being purchased in high risk sight unseen auction in the hands of someone who does not know rugs or is under false ideas + may need a wash, who knows - this all equates to caution or pay very little.