Back a few years I've always used an eBay template to make my listings look a little more professional and such.
However I noted that ebay no longer shows you the full item listing (user-generated description) unless you were on a desktop browser or have enabled the full site view when viewing on a tablet or mobile device.
This means that unless you were using a responsive HTML design, a template that looks fine on a desktop view would look absolutely horrible on a phone.
And obviously, a lot of eBay users now find it easier to bid and buy over a smartphone since it's just far more convenient.
Do you think templates are still a good idea (worth spending time or money into?)
I think not. Plain text and bullet points auto-resizes and wraps the text correctly, making it ideal to view on any device.
Also, ebay will turn off "active content" next month; such as Flash plug-ins, images and forms. There's no point going creating something that will disappear soon.