Greed is good. You can be greedy you just have to be fair and respect your employer's time and investment. They are not entitled to your labor in perpetuity just because they hired you. You have to give them something or risk burning bridges and not developing a professional network.
Feeling like your being taken advantage is something I think you should never express. One HN poster put it very eloquently. At the end of the month when you are paid you and your employe are square. You don't owe them anything and they don't owe you anything. By continuing to work there you are agreeing to trade the next month for what they have promised to pay you and no more.
Stay away from talking about the past. You can't collect on perceived past debts. That's also why I don't like to make compensation about performance. It's up to my employer to decide whether the business value I deliver is worth what I cost. If you have an offer in hand this is what you cost. It's not ambiguous or nebulous like performance and that's why managers love to talk about performance. Don't indulge them.
Sure I have felt taken advantage of, but it's not really your employer. It's the game. It's crap and we all have to work within it to maximize the value we can realize. Your employer is doing it and so should you.
And don't think I haven't lost with that strategy before. I have worked for people who did not recognize the business value I provided. It's not a big deal. It happens. You move on and maybe they are right or maybe you are right. Maybe the next thing is better than what you had or maybe it isn't
