A 2nd class package is £2.20 -am I missing something

[sherbetpips]

So as far as I know a package (not a letter) sent 2nd class in the uk is £2.20. So why do buyers on eBay try to make complaints about postage. I have had feedback comments with 'postage expensive, etc. Usually eBay remove them from serial complainers but am I missing something - are the post office ripping me off?

exactly 5 stars if problem free, no rip off everything as described

what ebay should say is

5 stars everything is fine exactly what they said i would get i got for reasonable price arrived on or before estimated date
4 stars a minor niggle slight overcharging, a bit slow maybe 1-2 days late
3 stars overcharged small faults not mentioned but nothing terrible or very late and needed to chse but fine in the end
2 stars major problems seller reluctant to put right but eventuially did
1 star major problems had to open case very unhelpful overcharged to point of fraud