Yup, it's a gambling-like buzz.
To be honest, ebay no longer provides the bargains that it used to 10 years ago.
You're quite likely to be caught for VAT and excise on anything worth over €150 imported from outside Europe, negating any saving.
A lot is on sale as buy it now, and prices are higher to accomodate the 20-25% transaction costs of ebay+ paypal.
I stopped selling on ebay 7 years ago because of this.
There are also other alternatives like Done-deal, Buy and sell and specialist auction houses, as well as the fact that most shops have some form of an online presence now, and have asjusted their pricing to compete with ebay.
However it is still the place for the stuff that just can't easily be found elsewhere, particularly electronics and spares.