According to Hyperallergic , in the museum world in general, the acquisition of artefacts is now mainly through donations. Only a minority of items are purchased.
In the United Kingdom, the trend is quite the opposite in the case of obtaining the items found by greedy metal detector wielding Treasure hunters. When we take away the number donated by the landowners (the actual owners of items coming from their land), 92% of them have to be bought through the payment of a Treasure Ransom from the public purse. The British public is being forced by heritage hoikers and heritage pocketers to buy back their own heritage. Something is very wrong with this.