I have sold a lot of stuff from the �1 shops on eBay for a reasonable profit, mostly to customers who live in the Scottish highlands and very rural areas.
Why people pay eBay prices for dvds I don't know. Sendit and Play are two excellent sites and there are plenty of others. And you know 100% they are going to be genuine when you buy from these big companies - the same can't be said for eBay.
A few years ago I noticed a boxed set of videos selling on eBay for �70+. I searched around and found them for �14.99 from Woolworths online. �1.99 postage regardless of how many sets you bought.
I sold 28 sets before Woolworths ran out.
I can't explain why people don't research before they buy.