It is a good thing to have slower transactions so less of them are happening so the miners don't get shit for what they are trying to do and that is skimming off the froth of the of their lattes.
Miners need to be paid, otherwise Bitcoin will die. They don't need to get greedy however, because that will kill their business too, if it's too expensive to send coins. If they get too greedy, the market will be flooded with miners as well, and the payouts will be less. Miners have to act responsibly. They need to walk a fine line or it could spell doom for bitcoin, and that would be a shame.