I wouldn't say the tenure matters as eBay is a third-party website which is more for businesses. 50+ feedback is pretty low in my opinion and wouldn't matter. What matters for eBay is how much you can sell monthly and business related stat. I have been offered $1000 for mine and the tenure is like 2011. I don't think you are allowed to sell anything eBay related here so just a notice.Otherwise I would appraise this at $150 to a business just because of the tenure and feedback.
I really cannot see this havin' much value on this website to be honest. Since I don't really thing anyone is that massive of an eBay user that they would need this.