Obviously there is profit but is it risk free?
The builder knows the value of his project better than anyone else.
The risk you are shouldering is:
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Whether project will be completed (Less of a risk with Prestige like builders and hence the discounts are lesser as well)
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Risk of whether the commitments/quality will be held up.
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Market risk: You are trying to predict how the RE market will look like 3-4 years down the line.
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Location risk: Today the eastern part of the city is hot but as metro lines open up, the dynamics of the market is fast changing.
You make a profit for shouldering these risks. Think it through and invest