Every ham radio operator should mail a QSL card for each QSO in the logbook, also if he don't collect himself no or anymore QSL cards.
The reason is simple: Perhaps your dialogue partner just begins to collect QSL cards as memory or for awards.
Here you can see my QSL cards, which are self-evident sended via bureau or direct to the dialogue partners.
Above you can scroll through my QSL cards send so far.
Many of this QSL cards were printed by QSL-Shop.
Because printing special QSL cards with minimum quantities of 500 or 1000 pieces is not economically for less than 50 QSO′s, in my opinion.
Therefore I have chosen for my smaller DXpeditions often postcards or photos with labels on it.
And since I am always busy sending QSL cards, I have now received many QSL cards through the QSL office - some also directly.
I have therefore once reached into the boxes used for storage and scanned an unrepresentative selection.
You can view here a selection of cards from DX stations and from stations inside Europe.