Nice
Not nice at all. If a single "bored" person can double the hashrate it means the security of this coins is down the drain.
A lot of coins suffer the problem of low hash rates. We're implementing Pulse soon, to link the block creation to the number of transactions. This will make the coins more valuable, because the creation will slow down if no transactions are sent.
You can read more here! https://bitcointalksearch.org/topic/qbpulse-dynamic-block-creation-with-pulse-for-quarkbar-676149
Sorry but not mining is deciding the value of a coin.
The value will be decided only by usage and the market.
You can make a coin hard to mine as the 12 labors that won't make it worth 1000$.
Pulse is about increased creation of coins when the coin has a lot of transactions. The difficulty will always be low and the network can actually be supported by a small amount of mining power.