I have two collections. One is old (curious stones) and the other is young (a stamp).
Actually, the old collection became too heavy and had to be dispersed in locations all across the land. One by one so as not to draw any attention. It's called fly tipping in the UK. The young collection is light and easy to carry around. I don't know if I'll add to it because it's nice as it is.
At my local post office I always ask for stamps instead of the disagreeable label they like printing out and sticking on regardless of its position on my carefully designed address lettering. Unfortunately, they don't like adding up the individual stamps and sticking them on the parcel. Once I was told 'because it will take too long'.
I try to change their mind by saying that I want the stamps because the parcel is for a young relative or a friend's child and they like to see the different pictures on the stamps and that they even collect all the stamps and keep them in a scrap book. One day I said this, but the letter was addressed to 'Her Majesty's Customs and Excise' and ever since then I've been given labels.