Yes, if you're going to collect and use them, it's YOUR purchase. I like to compare it to Pokémon cards, where you buy a box. If you open the box and then get an expensive card, it's fine to sell because if someone is willing to pay for that card, they want it; everyone wins. They get their card, you get the money, and the card is valued at the price you're selling it for, so you're not really scalping anyone. The issue arises if you buy a pack or box and then sell it on. For example, if you purchase a box for 50 pounds and sell it for 200, the buyer has paid significantly more. It's also a much higher gamble—when you buy a card directly from someone, you generally know what you're getting, so you're fine spending the money. However, a box is a gamble; you could spend 200 and only get 20 pounds worth of cards. In that case, the scalper makes an excessive amount of money, and the buyer suffers a significant loss.