An example of an "ungrateful investor" is the following situation:
100 people invest $1000 each in a company to build a product. They hire hire a developer who works for them for a year to produce their product. At the end of the year, the developer moves on to another job. The product isn't quite done yet. The investors have a half finished product that is unable to earn them a return.
A new investor comes in with an offer to add another $100,000 to the pot to hire the developer for another year and this new investor only demands 40% equity. The original 100 investors are split. Some are very happy that their investment has new life, others are pissed that they have been diluted.. still others demand that the original developer work for free for as long as it takes.
Each and every day people are spending capital to grow the value of BitShares. The angels that gave us the initial funds only got us so far and we had to raise another round.