The game shouldn't be balanced to accommodate noobs or ironmen.

Lol wat? Yes it should. Noobs turn into good, committed players. If you don't ensure noobs are having fun, then you will never get good players.

All enchanted jewelry other than dragonstone is destroyed on its final use, so dragonstone should follow the same rule.

Why? The whole point is that dragonstone is a lot rarer and has more power. If you make it degrading, all it does is stop people using it to teleport. Even at todays prices, few people would pay 4k+ per time to teleport to relatively easy to get to places. Prices would obviously go up though, so do you think many people would pay 5-10k? No. All you're doing is making an item dead content. If you want an item sink, be creative and add to the game, instead of taking away.