There are 103 active masternodes at the moment of writing. The daily income is $878.7176, which gives you everything to reach the breakeven point very soon. However, I don't think that the project will get any harm from an increased number of masternodes. It's very attractive in terms of investing in it.
I thought, the more masternodes are active, the less less frequency of rewards. That’s useful information for investor.
That's true. But at the same time, as long as the coin grows in price (which MUST happen as we become bigger), all investors will be getting decent gains, regardless of how much masternodes will run the network.