But buying shares is risky, and you can just invest somewhere else (coinlenders, just-dice, and so on).
How so? Can you elaborate on the dangers of buying shares in mining
It is dangerous, to mine the same amount of BTC daily, you must add +30% hashing power every 2 weeks. This is how steady difficulty increases last few months
30% seems a lot. But if the price were to increase steadily as time goes on, surely with one producing less coins, the value of these coins would go up and things would even out.
Or am I missing something?