I am a recent newby to
ebay, I regularly buy the cheapies,
lots of fun,
ebay has yet to fail me in delivery.
1 niggle was a vendor selling short sets without advice,
but I can live with that.
What I don't care for are cheap stamps for sale 1 at a time
or just a few stamps but overpriced.
If I find a vendor selling reasonable stamps, I may buy several packets
or return to his shop / avatar regularly.
Try not to overprice on your shipping.
A half reasonable scan is a must also, even if an indicative sample
is shown.